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Pacific Northwest Conservation Science Consortium Projects

Suzuki Harunobu Project

Analysis of Red Colorants

With the support of the Pacific Northwest Consortium, curator Jeannie Kenmotsu, Ph.D. and conservator Samantha Springer at the Portland Art Museum (PAM) selected a project focusing on extended analysis of multi-colored Japanese woodblock prints by the celebrated artist Suzuki Harunobu. Harunobu pioneered the Japanese Ukiyo-e print aesthetic characterized by the use of five or more colors during printing. The project utilized X-Ray Fluorescence (XRF) spectroscopy to identify a range of inorganic red colorants and Surface-Enhanced Raman Spectroscopy (SERS) to identify organic red colorants within a fluorescent proteinaceous binding medium. The scientific research informed PAM's exhibition Suzuki Harunobu and the Culture of Color (June 23-September 16, 2018) and was able to significantly contribute to the scholarship for the exhibition.

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Publications

Lyndsay N. Kissell, Trine K. Quady, Dario Durastanti, Samantha Springer, Jeannie Kenmotsu and Tami Lasseter Clare, (2022), A multi-analytical approach to identify red colorants on woodblock prints attributed to Suzuki Harunobu, Heritage Science, 10, 94, https://doi: 10.1186/s40494-022-00731-4.

Lyndsay N. Kissell, Trine K. Quady and Tami Lasseter Clare, (2022) Optimized micro-sampling and computational analysis for SERS identification of red organic colorants, Spectrochimica Acta A, https://doi.org/10.1016/j.saa2022.120857.

Exhibitions

Tami Lasseter Clare and Jeannie Kenmotsu, Art - Suzuki Harunobu and the Culture of Color, Exhibition, Invitational, "Science of Color," Portland Art Museum, Portland, OR USA, Non-Academic, International, June 23 - September 16, 2018.

Presentations

Lyndsay N. Kissell, Trine K. Quady, Samantha Springer and Tami Lasseter Clare, Elucidation of natural organic red colorants on paper via microsampling and Surface Enhanced Raman Spectroscopy, 49th Annual Meeting of the American Institute for Conservation, May 26, 2021.

Lyndsay N. Kissell, Trine K. Quady, Samantha Springer and Tami Lasseter Clare, Identification of organic colorants using Surface Enhanced Raman Spectroscopy (SERS) as a minimally invasive method for analysis of works on paper, 74th Northwest Regional Meeting of the American Chemical Society, June 18, 2019.

Lyndsay N. Kissell, Trine K. Quady, Samantha Springer and Tami Lasseter Clare, Surface Enhanced Raman Spectroscopy as a minimally invasive method for definitive identification of organic colorants on paper, American Institute for Conservation, Uncasville, CT, May 2019.

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Chilkat Dye Project

Historic and Contemporary Chilkat Dyestuffs

The Chilkat Dye Project is part of the Pacific Northwest Conservation Science Consortium and represents a collaboration between the 25-member Chilkat Dye Working Group, conservator Ellen Carrlee at the Alaska State Museum (ASM) and the Clare Lab. This collaboration aims to identify the dyestuffs used to create the three iconic colors (blue/green, brown/black, and yellow) which typify indigenous Chilkat ceremonial textiles. Through the elemental and mass-spectral analysis of reference dyed fibers provided by the Chilkat Working Group as well as fiber samples representing 23 textiles at the ASM, results were obtained which indicate that both natural and synthetic dyes have been used over the past two centuries of Chilkat blanket production. This research has provided content for the ASM exhibit The Spirit Wraps Around You: Northern Northwest Coast Native Textiles, and sparked science curriculum for local schools. Additionally, Chilkat weavers are learning about their ancestors' dye choices and use this knowledge to inform their own artistry. Ultimately, this collaboration will create a model of research that foregrounds the priorities of indigenous people through a network of long-term relationships.

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Exhibitions

Tami Lasseter Clare and Ellen Carrlee, Art - The Spirit Wraps Around You, Northern Northwest Coast Native Textiles, Organized by the Alaska State Museum, Juneau, AK USA Non-Academic, International, (Invited), May 7 - October 9, 2021.

Presentations

Dario Durastanti, Lily Hope, Ellen Carrlee, and Tami Lasseter Clare, Collaborative investigation into wool dyeing practices of Chilkat textiles: culture, chemistry, and conservation, Sealaska Heritage Institute: Northwest Coast Weavers Gathering, Juneau, AK, June 2022.

Dario Durastanti, Lily Hope, Ellen Carrlee, and Tami Lasseter Clare, Collaborative investigation into wool dyeing practices of Chilkat textiles: culture, chemistry, and conservation, American Institute for Conservation, Los Angeles, CA, May 2022.

Tami Lasseter Clare, The Chilkat Dye Project, ArtBio Matters, The Metropolitan Museum of Art, September 2021.

Tami Lasseter Clare, Identification of Historical Dyes Using Mass Spectrometry, Sharing Our Knowledge, Juneau, AK, (Invited), September 2019.

Dario Durastanti, Ellen Carrlee and Tami Lasseter Clare, Chilkat robe dye analysis by GCMS to identify historical dye sources, Users Group for Mass Spectrometry and Chromatography, Ottawa, CA, June 2019.

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Orotones Project

Analysis of a Unique Photographic Collection

The Clare Lab, in collaboration with curator Nicolette Bromberg and conservator Claire Kenney at the University of Washington Libraries, has been engaged in a characterization study of the materials and processes used in the creation of orotone photographs. Especially popular during the early 20th century along the American West Coast, orotone photographs are notable for their gold-colored appearance. The photographic process utilizes a positive image on a clear glass plate with a subsequently applied gold-colored metallic backing. The Clare Lab analyzed a range of orotones and silvertones from the University of Washington LIbraries as well as one orotone from the Portland Art Museum (PAM). The backing metals were identified as well as the photographic processes and glass composition. Fourier Transform Infrared (FTIR) and Raman spectroscopies added to this analysis and positively identified colorants used in hand-colored orotones. Finally, a delaminating orotone at PAM prompted an analysis of its backing fluid, which yielded surprising results and may indicate use of an unusual photographic material.

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Presentations

Vanessa Johnson, Ivanny Jácome Ottati, Claire Kenny, and Tami Lasseter Clare, Identifying materials and processes used in the manufacture of orotone, hand-colored orotone, and silvertone photographs, Western Association for Art Conservation annual meeting, Seattle, WA, October 2022.

Vanessa Johnson, Ivanny Jácome Ottati, Claire Kenny, and Tami Lasseter Clare, Identifying materials and processes used in the manufacture of orotone, hand-colored orotone, and silvertone photographs, MS&T22 Technical Meeting and Exhibition, Pittsburgh, PA, October 2022.

Ivany Jácome Valladares, Claire Kenney, Stephanie Lamson and Tami Lasseter Clare, The development and application of instrumental methods for the identification of materials and processes used in the manufacture of orotone photographs, 2021 AIC/SPNHC Joint Virtual Annual Meeting, May 26, 2021.

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Mark Tobey Paint Binders

Mark Tobey was one of the founders of the Northwest School, an art movement which brought attention to contemporary art in the Pacific Northwest in the mid-20th century. Tobey, primarily a painter, often worked with gouache or tempera paints, both aqueous media which can vary in composition. Working in collaboration with Nicholas Dorman at the Seattle Art Museum (SAM) and Chris White at the Jordan Schnitzer Museum of Art (JSMA) in Eugene, the Clare Lab has endeavored to analyze Mark Tobey's paint formulations in order to inform conservation efforts and improve understanding of Tobey's working methods. Conservators at the SAM and the JSMA have provided paint samples from a range of paintings in their collections, which have been analyzed via Pyrolysis Gas Chromatography Mass Spectrometry (py-GCMS) to identify the binding media, the material in which pigments are suspended. While work is ongoing, already a range of materials such as waxes, proteins and gums have been detected, and further results are expected to testify to the complexity of Tobey's process.

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Presentations

Vanessa Johnson, Nicholas Dorman, Chris White, and Tami Lasseter Clare, Investigation of Mark Tobey's paint materials using mass spectrometry methods, Western Association for Art Conservation annual meeting, Seattle, WA, October 2022.

Vanessa Johnson, Nicholas Dorman, Chris White, and Tami Lasseter Clare, Investigations of the binding medium of Mark Tobey paintings using pyrolysis-GC/MS, American Institute for Conservation, Los Angeles, CA, May 2022.

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Lully Manuscript

The University of Washington Libraries with conservator Justin Johnson selected the considerably damaged late 17th century operatic score Atys Tragedie by Jean Baptiste Lully for analysis. The manuscript is believed to be one of the seven extant complete copies in the world. The manuscript's condition is characterized by water damage, mold growth, and multiple repairs of various stabilizing materials. The impetus for further analysis was to determine the specific types of historical repairs in order to serve as a reference for complex adhesives for bound works on paper. Utilizing small samples removed from the manuscript, Fourier Transform Infrared (FTIR) analysis was used to characterize the adhesives used in previous repairs of the manuscript. The analysis determined the presence of four classes of adhesives, including proteins (i.e. animal glues), carbohydrates (i.e. rice paste), waxes and synthetic resins.

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Ongoing and Past Projects

Clear Coatings for Metals

Development of protective clear coatings for metals

Means of protecting outdoor metals must balance the need to provide adequate metal protection while being environmentally conscientious. The goal of this project was to develop and evaluate a new clear coating for metal that will be environmentally safe and long lasting, thus saving museums time and money, as well as reducing hazards for conservation staff. Over the course of this project, a double-blind study of candidate coatings was undertaken with participation of volunteer conservators who evaluated the coatings based on qualitative parameters, such as ease of use, appearance, and workability. Concurrently, accelerated and natural weathering studies of the candidate coatings on both patinated and bare bronze and iron samples was undertaken. The performance of the coatings during exposure was analyzed using electrochemical impedance spectroscopy and other scientific methods as required. This work was in partnership with the Philadelphia Museum of Art and funded by the Institute of Museum and Library Services.

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Publications

N.A. Swartz, C.A. Price, T.L. Clare (2016). Minimizing corrosion of outdoor metalworks using dispersed chemically stabilized nanoclays in polyvinylidine fluoride latex coatings, ACS OMEGA, 1, 138-147.

N.A. Swartz, T.L. Clare (2015). On the protective nature of wax coatings for culturally significant outdoor metalworks: microstructural flaws, oxidative changes and barrier properties, Journal of the American Institute for Conservation, 54 (3), 181-201.

N.A. Swartz, T.L. Clare (2012). Characterizing and improving performance properties of thin solid films produced by weatherable water-borne colloidal suspensions on bronze substrates. Progress in Organic Coatings, 75 (3), 215-223.

N.A. Swartz, T.L. Clare (2012). Understanding the differences in film formation mechanisms of two comparable solvent based and water-borne coatings on bronze substrates by electrochemical impedance spectroscopy. Electrochimica Acta, 62, 199-206.

Presentations

Tami Lasseter Clare, Strategies toward better protection of outdoor metalwork, Getty Conservation Institute, (Invited), December 2016.

Tami Lasseter Clare, Protecting material cultural heritage using waterborne, weatherable coatings containing polyvinylidine fluoride, American Chemical Society, (Invited), August 2014.

Natasja A. Swartz and Tami Lasseter Clare, Use of waterborne protective coatings with nanoclay additives to protect artwork, 68th ACS Northwest Regional Meeting, Corvallis, OR, July 21-24, 2013.

Kathryn N. Hosbein, Natasja A. Swartz and Tami Lasseter Clare, Predicting failure of protective coatings used on sculptural and architectural outdoor metalwork, 1st Annual Portland State University Student Symposium, Portland, OR, May 8, 2013.

Tami Lasseter Clare, Rethinking conservation of public artwork: developing high-performance coatings and monitoring their efficacy in the field. Oral Presentation, presented at Western Washington University, October 2012.

Tami Lasseter Clare, Rethinking conservation of public artwork: developing high-performance coatings and monitoring their efficacy in the field. Oral Presentation, presented at ACS Local, Portland State University, September 2012.

Natasja A. Swartz, Kurt A. Wood and Tami Lasseter Clare, Spectroscopic analysis of aging fluoropolymer and acrylic clear coatings. 2012 American Coatings Conference, Indianapolis, IN, May 7, 2012.

Natasja A. Swartz and Tami Lasseter Clare, Reducing water sensitivity in water-borne PVDF-latex nanocomposite coatings by controlling long-range order of a synthetic nanoclay. 243rd ACS National Meeting, San Diego, CA, March 29, 2012.

Natasja A. Swartz and Tami Lasseter Clare, Fundamental analysis of weatherable polymer films for the protection of outdoor artwork, ACS NORM 2011, Portland, OR, June 28, 2011.

Tami Lasseter Clare, Understanding performance properties and limitations of coatings for metals. Western Association for Art Conservation annual meeting, Portland, OR, September 2010.

Tami Lasseter Clare, Understanding performance properties and limitations of coatings for metals. Presented at AIC Annual Meeting, Milwaukee, WI, May 2010.

Tami Lasseter Clare, Coordinating a three-year study on federally-compliant protective clear coatings for metals. Oregon State University, Materials Science Department, Corvallis, OR, April 2009.

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Electrochemical corrosion monitoring

On-site corrosion monitoring at the Olympic Scupture Park

In this project we partnered with the Seattle Art Museum and used their Olympic Sculpture Park as a field-test site. We are developing an on-site electrochemical monitoring method for early detection of coating failure. Coatings are commonly applied to artworks as protective barriers against deterioration or corrosion. For outdoor artworks, coatings are reapplied periodically as they degrade from the effects of pollutants, salts, light and moisture. Collections care personnel rely on the presence of visual cues (e.g. chalking, flaking and corrosion) to determine when coating reapplication is needed. However, these cues are signs that coating failure and damage to the underlying artwork has already occurred. A need exists for analytical methods to support preventive care, using tools that permit the rapid, on-site evaluation of protective coatings.

Watch the Clare Lab at work at the Olympic Sculpture Park

Fluorescent and Electrochemical Corrosion Sensors

Common methods of in situ corrosion sensing on metal objects require direct access to metal, are destructive, or can only detect corrosion after significant damage is done. In the Clare Lab, we are working to develop a new corrosion sensing material that combines a polymeric hydrogel network with fluorescent carbon quantum dots to produce a flexible, non-invasive material for surface detection of metal ions - the first indicators of active metal corrosion. This material can provide analysis of metal condition through its swelling, electrochemical, and fluorescent properties, providing a multi-analytical tool for detection of active corrosion species before damage is visible on the metal surface.

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Publications

C.A. Price, T.L. Clare (2019). Rapid quantitative spectroelectrochemical responses of hydrogel-based sensors for the in situ evaluation of corrosion inhibitors on steel. Sensors and Actuators B, 289, 175-181. DOI: 10.1016/j.snb.2019.03.022.

C. Hensen, T.L. Clare, J. Barbera (2018). Using quenching to detect corrosion on sculptural metalwork: a real-world application of fluorescence spectroscopy. J. Chem. Educ., 95, 858-863, DOI: 10.1021/acs.jchemed.7b00726.

C.A. Price, J. Carroll, T.L. Clare (2018). Chemoresistive and photonic hydrogel sensors of transition metal ions via Hofmeister series principles. Sensors and Actuators B, 256, 870-877. DOI: 10.1016/j.snb.2017.10.031.

K.N. Hosbein, A.H. England, C.A. Price, T.L. Clare (2017). Measuring sheet resistances of dielectrics using co-planar hydrogel electrochemical cells with practical applications to characterize the protective quality of paints on sculptures. Electroanalysis, 29 (5), 1377-1387. DOI: 10.1002/elan.201600765.

A.E. England, K.H. Hosbein, C.A. Price, M.K. Wylder, K.S. Miller, T.L. Clare (2016). Measuring the impedence of waxed bronze sculptures using hydrogel patches to assess protective coating quality. Coatings, 6 (4), 45. DOI: 10.3390/coatings6040045.

A.E. England, T.L. Clare (2014). Synthesis and characterization of flexible hydrogel electrodes for electrochemical impedance measurements of protective coatings on metal sculptures. Electroanalysis, 26, 1059-1067.

K.H. Hosbein, N.A. Swartz, T.L. Clare (2014). Electrochemical identification and categorization of the protective quality of intact and damaged coatings. Electroanalysis, 26 (9), 1935-1944.

T.L. Clare, A.E. England, N.A. Swartz, K.N. Hosbein (2013). Onsite electrochemical monitoring method for early detection of coating failure. Proceedings of the ICOM-CC Metals 13 Triennial Meeting. (peer reviewed)

Presentations

Lydnsay N. Kissell and Tami Lasseter Clare, Passivated carbon quantum dot-hydrogel materials as a novel metal ion sensor: Toward the early detection of corrosion on metal substrates. 74th Northwest Regional Meeting of the American Chemical Society. June 17, 2019.

Capri Price, James Carroll and Tami Lasseter Clare, Multiresponsive hydrogel sensors for transition metal ions via Hofmeister series principles. National ACS Meeting, Analytical Poster Division & Sci-Mix Poster Session, New Orleans, LA, March 2018.

Capri Price, James Carroll and Tami Lasseter Clare, Early detection of corrosion via spectroelectrochemical techniques. Northwest Regional ACS Meeting, Anchorage, AK, July 2016.

Alice H. England and Tami Lasseter Clare, Use of flexible hydrogel electrodes as diagnostic tools to protect artwork. Materials Research Society Fall Meeting, Boston, MA, December 3, 2013.

Tami Lasseter Clare, Onsite electrochemical monitoring method for early detection of coating failure. ICOM-CC presented at ICOM-CC Triennial Conference: Metal 13, Edinburgh, UK, September 2013.

Alice H. England and Tami Lasseter Clare, Development of novel hydrogel electrodes for EIS of protective coatings on outdoor artwork. AVS Pacific Northwest Chapter Annual Symposium, Troutdale, OR, September 20, 2013.

Alice H. England and Tami Lasseter Clare, Development of a field monitoring technique for protective coatings on outdoor metal artwork. Western Association for Art Conservation Annual Meeting, Seattle, WA, September 18, 2013.

Alice H. England and Tami Lasseter Clare, Use of flexible hydrogel electrodes as diagnostic tools to protect artwork. Oregon Academy of Sciences Annual Meeting, Willamette University, Salem, OR, March 2, 2013.

Tami Lasseter Clare and Natasja N. Swartz, Characterization and in situ monitoring of protective coatings for culturally significant outdoor works. Poster session, presented at Gordon Research Conference, Mt. Snow, VT, August 2012.

Tami Lasseter Clare, Correlating electrochemical impedance spectra and structural changes in latex films. Oral Presentation, presented at American Coatings Association, Metal protection through coatings technology conference, Pittsburgh, PA, October 2010.

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Materials analysis of Ethiopian manuscripts

Ethiopian Religious Manuscripts in Context

Since the 4th century A.D., the cultural identity of the Ethiopian people has been strongly tied to the Ethiopian Orthodox Church. For over sixteen centuries a scribal community has thrived in Ethiopia and reproduced religious doctrine that consisted not only of bible passages, but reflect the art and record important communal activities of the people and nobility. Today, scribes still produce manuscripts in Addis Ababa and elsewhere, and are thus passing the knowledge of the production of religious texts to the next generation. 

Inks and paints used in these manuscripts consist of color (pigments) and a binding agent. By comparing the inks and paints in the Walter Codex with traditional materials thought to be used by Ethiopian scribes, the inked passages and illuminations may be authenticated and possibly dated. Due to the chemical complexity of inks and paints, multiple analytical techniques are required for complete analysis. Prior scientific studies of Ethiopian Orthodox art focused on icons – manuscripts have not been previously studied.

This outreach work was in partnership with Dr. Stephen Delamarter at George Fox University and was partially funded by the NSF.

Outcomes from this work included presentations at the 2010 AAAS Pacific Division conference in Ashland, OR and the 2011 AAAS National meeting in Washington, D.C. Graduate student Natasja Swartz was awarded an AAAS travel fellowship from her presentation at the local division conference which enabled her to travel to the national meeting.

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Presentations

Natasja A. Swartz and Tami Lasseter Clare, Multi-analytical characterization of Ethiopian religious texts. 7th Sigma-Xi Columbia Willamette Research Symposium, Portland, OR, April 11, 2011.

Tami Lasseter Clare and Natasja N. Swartz, Multianalytical characterization of Ethiopian manuscripts. Poster session, American Association for the Advancement of Science, presented at AAAS National Meeting, Washington, DC, February 2011. (Invited)

Natasja A. Swartz and Tami Lasseter Clare, Multi-analytical characterization of Ethiopian religious texts. 2011 AAAS Annual Meeting, Washington, D.C., February 20, 2011.

Natasja A. Swartz and Tami Lasseter Clare, X-ray spectroscopy and a Fourier-transform-infrared analysis of Ethiopian inks. European Science Foundation, Research Networking Programme, Comparative Oriental Manuscript Studies, Digital support for manuscript analysis, Hamburg, Germany, July 23-24, 2010 (talk presented by Stephen Delamarter, Professor of Religion, George Fox University.) (Invited)

Natasja A. Swartz, Aaron Ray and Tami Lasseter Clare, Use of x-ray microanalysis and infrared microspectroscopy for multianalytical characterization of the Walter Codex, an Ethiopian manuscript. 91st Annual AAAS Pacific Meeting, Ashland, OR, June 15, 2010.

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Bronze Money Tree

Scientific analysis of a Chinese Bronze Money Tree

The specific goals of this project were to address the Portland Art Museum's concerns about an object in their collection, a Chinese bronze Money Tree, believed to date from the Eastern Han Dynasty (25 - 220 CE). Money Trees are burial objects that have a stylized tree-like form with the possible intended purpose of providing the deceased with prosperity in the afterlife. The Portland Art Museum's Money Tree was a donated gift from a private collector and had neither documentation as to the location or date of its excavation, nor any subsequent documentation prior to its acquisition by an art dealer. Students, both at the undergraduate and graduate levels were involved in this interdisciplinary and inter-institutional project. Their work directly addressed the PAM's interest in understanding the strength of the Tree's corroded bronze and understanding whether the individual branches of the Tree came from the same original set or whether the branches were compiled and assembled to produce a complete Tree. This work was in collaboration with the Portland Art Museum.

Elemental mapping of a branch shows that the branch was repaired using lead/tin solder and that the alloy composition of the thin tenon is different from the rest of the branch. Those findings suggest that the repair is not original to the Tree and indicate that someone carefully repaired and disguised the break before the Tree was sold.

Outcomes from this work included presentations at the 2010 AAAS Pacific division conference in Ashland, OR and at the annual meeting of the 2010 Western Association for Art Conservation in Portland, OR. This work has been featured in articles in The Oregonian and Portland Monthly Magazine.

The Money Tree was returned to the Portland Art Museum and then displayed in a special exhibition titled, "Cornerstones of a Great Civilization." Dr. Lasseter Clare was invited to give a public talk at the Portland Art Museum about her findings on March 4th, 2011.

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Exhibitions

Tami Lasseter Clare and Maribeth Graybill, Art - Cornerstones of a Great Civilization, Portland Art Museum, Portland, OR USA, Non-Academic, International, March 3, 2012 - November 11, 2012. (Invited)

Presentations

Tami Lasseter Clare, Uncovering mysteries of a Chinese burial relic. Sponsored by the Asian Art Council and the Portland Art Museum, March 2012. (Invited)

Tami Lasseter Clare, Uncovering mysteries of a Chinese burial relic. Presented at Western Association for Art Conservation annual meeting, Portland, OR, September 2010. 

Tami Lasseter Clare, Uncovering mysteries of a Chinese burial relic. American Association for the Advancement of Science, presented at AAAS Pacific Division, Ashland, OR, May 2010. (Invited)

Priyanka Chand, Sam Denney and Tami Lasseter Clare, X-ray fluorescence characterization of the Money Tree. Portland Art Museum, June 2009.

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Outreach Projects

Our Presence in the Community

We serve the greater community by focusing our research efforts on the preservation of works of cultural heritage through collaborations with local and regional art museums and conservators.

One of our volunteer projects brought the lab to Fort Vancouver National Historic Site in Washington state. We hope that our findings may help archaeologists better determine what the excavated sites may have been originally used for: whether the ash layers we collected and analyzed may have been used as cooking hearths or for other purposes.

Numerous interns and undergraduate students aiming to continue their education in either graduate programs in art conservation or chemistry have participated in research projects. We pride ourselves on tailoring research projects to suit student's interests, abilities and educational goals.

We believe in broadening the participation of underrepresented groups and engaging in STEM (science, technology, engineering and mathematics) education.

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Presentations

Tami Lasseter Clare, Pigment of your imagination: tales of artwork from a conservation science perspective. School of Materials, Boise State University, Boise State University, Boise, ID, February 2020. (Invited)

Tami Lasseter Clare, Pigment of your imagination: tales of artwork from a conservation science perspective. Portland Art Museum, European and American Art Council, November 2016. (Invited)

Tami Lasseter Clare, Chemical insights to protect outdoor sculpture and restore paintings. Faculty Brown Bag Lunch, Portland State University, College of Liberal Arts and Sciences, May 2015. (Invited)

Tami Lasseter Clare, Electro- and analytical chemistry in the service of artwork. University of Texas at Dallas, Department of Chemistry, March 2015. (Invited)

Tami Lasseter Clare, Electrochemistry in the service of artwork. Portland State University, Department of Chemistry, January 2015.

Capri Price, Natasja A. Swartz, Doug Wilson and Tami Lasseter Clare, Quantitative elemental analysis of historical soils through XRF, AAS, ICP-OES and EDX. International Symposium on Archaeometry, Los Angeles, CA, May 2014.

Capri Price, Natasja A. Swartz, Doug Wilson and Tami Lasseter Clare, Quantitative elemental analysis of historical soil by x-ray fluorescence. Northwest Regional ACS Meeting, Corvallis, OR, July 22, 2013.

Capri Price, Natasja A. Swartz, Doug Wilson and Tami Lasseter Clare, Quantitative elemental analysis of historical soil by x-ray fluorescence. PSU Student Research Symposium, Portland, OR, May 8, 2013.

Capri Price, Natasja A. Swartz, Doug Wilson and Tami Lasseter Clare, Quantitative elemental analysis of historical soil by x-ray fluorescence. Oregon Academy of Sciences Meeting, Salem, OR, March 2, 2013. 

Tami Lasseter Clare, Conservation of cultural heritage as a platform for research, engagement and education. Lecture, Sigma Xi, Columbia Willamette Chapter, Portland, OR, October 2010. (Invited)

Tami Lasseter Clare, Seeing metal artwork through the eyes of a materials chemist. Lecture, Pacific University, presented at Departmental Seminar, Forest Grove, OR, September 2010. (Invited)

Tami Lasseter Clare, Imaging and analytical techniques aiding in the authentication of works of art. University of Oregon, Jordan Schnitzer Museum of Art and Art History Deparment, Eugene, OR, November 2009.

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