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Wednesday, May 15 • 4:00pm - 4:30pm
(Textiles) Taking Cues and Measuring Hues: Using Paper Conservation Methodology In the Light Bleaching Of Textiles

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Although not commonly practiced today, the use of light to bleach textiles has been used since antiquity with continuing popularity until the 20th century. While often used in paper conservation, there has been very little published regarding the use of light bleaching for historic textiles in the conservation literature. In 1979, Annis and Regan investigated the use of light bleaching on historic white cottons, while Gardiner and Hackett (1998) spoke of using a calcium hydroxide bath for light bleaching of large textiles. A preliminary study, undertaken at the Canadian Conservation Institute, aims to investigate the potential of light, from various sources, as a viable alternative to chemical bleaching following methodologies set out by paper conservators.

Fourteen sets of laboratory tea-stained and naturally aged cotton samples were tested using two techniques: immersion and non-immersion in alkaline solutions (pH 9) prepared using calcium hydroxide. Sample sets were each exposed to a single light source: sunlight (average 109,774 lx; up to 4 hours), light-emitting diode (LED, 23,325 lx; up to 24 hours), and ceramic metal halide (CMH, 42,256 lx; up to 24 hours) with a cumulative light dose of 1.01 Mlxh. A series of stained samples were also exposed to the same testing conditions, but in the absence of light. All samples were removed at different time intervals, and colour and pH measurements were carried out to determine the rate of colour change. In addition, microfade testing (MFT) with a xenon arc light source was undertaken to compare bleaching results among the different light sources. The effectiveness and rate of light bleaching by immersion is compared to that of the non-immersive technique under different lighting conditions.

Speakers
avatar for Caitlyn Picard

Caitlyn Picard

2018/19 Post Graduate Textile Conservation Fellow, Canadian Conservation Institute
Caitlyn Picard is the 2018/19 post-graduate textile intern with the Canadian Conservation Institute and the current National Capital Region Regional Representative for the Canadian Association for Conservation of Cultural Property. A graduate of the MPhil programme in Textile Conservation... Read More →

Co-Author
avatar for Crystal Maitland

Crystal Maitland

Conservator - Paper, Canadian Conservation Institute
Crystal Maitland joined the Canadian Conservation Institute in 2015 as their Works of Art on Paper Conservator. Prior to this, she served for seven years as the Paper Conservator at the Johns Hopkins University Sheridan Libraries and Museums in Baltimore, MD. Originally from Western... Read More →
JW

Janet Wagner

Conservator, Canadian Conservation Institute
Janet Wagner is a Textile Conservator at the Canadian Conservation Institute, Ottawa, where she treats a variety of textiles and costumes. She received her education in Clothing and Textiles at the University of Alberta, Edmonton, and in Museum Studies, Textile Conservation, at the... Read More →
RD

Renée Dancause

Conservator - Textiles, Canadian Conservation Institute
Renée Dancause graduated with distinction in 1990 from the University of Alberta with a BSc degree. Her course of study was clothing and textiles, specializing in the conservation of historic textiles. Renée has worked as a textile conservator at the Canadian Conservation Institute... Read More →
avatar for Season Tse

Season Tse

Senior Conservation Scientist, Canadian Conservation Institute
Season Tse was a senior conservation scientist at the Canadian Conservation Institute (CCI). She graduated in Applied Chemistry at the University of Waterloo, received her M.Sc. in Chemistry from Carleton University, and joined CCI in 1984. Her research focused on treatments for historic... Read More →


Wednesday May 15, 2019 4:00pm - 4:30pm EDT
Oneida/Penobscot Rooms Sky Convention Center, Mohegan Sun
  Specialty Session, Textiles
  • Track Textiles
  • Ticketed Included in Main Registration
  • Authors in Publication Order Caitlyn Picard, Renée Dancause, Crystal Maitland, Season Tse, Janet Wagner
  • Abstract ID 18598
  • Tags light bleaching,textiles,natural,artifical