Mary,
Lascaux is good also.
You are lucky to get that book. I lucked out and got the last copy available anywhere for sale at the Rhode Island School of Design Art Supply Store. Which I might add after teaching there for three benighted years, was the most positive thing to happen to me.
It may also be true that fixative will darken a more absorptive paper surface, than an acrylic or sanded surface.
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