At the 2002 ASOPA conference I had an interesting conversation with Virgil Elliott (SOG artist and sometime contributor to this forum) about archival pastel materials.
As many of you know, he consults with the ASTM folks on the archival characteristics of many media, grounds, etc. When we spoke at ASOPA he was particularly emphatic about the fugitive qualities of certain pastel colors.
It would be worthwhile contacting him directly, I think, if anyone wanted to know more about the research he has been doing (for ASTM, I believe).
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