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From Graydon Parrish

Published before 2005


Those are modern ideas of scumble and glaze that don't seem to be supported by history, for the most part. In the Delacroix book, he only uses the terms frottis and glacis. I think you need further clarification and study before your book is published to really pin down the definitions. Why call something different if it's light over dark or vice versa? Also, if you are going to say something shifts toward blue, which blue? Scumbling white over dark blue may not hold the local since whites, lead vs. zinc, titanium have different color signatures.