I just did a google search on Ross Merrill and the pastel subtrate issue and couldn't find it the the 5 minutes I looked. I would be interested in reading it. Personally, I don't like using pastel on hard surfaces and I don't really like that material they call pastel cloth either. I think stretching polyester would a good solution. I don't know about the archivalness of working on a cloth. I do know there is a Manet pastel drawn on primed linen at the Metropolitan Museum that looks none the worse for wear.
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