It might be prudent to add a few words, a caveat of some kind, to the docs
somewhere in 3.5.1 "Pigment", about this. To help new users, or at least steer
them clear from the path I went down, re: wondering why multi bare pigments
don't work 'as might be expected' based on what it says there. ;-) I imagine
that most newbies would look there first, to find out about pigments in general.

I wouldn't know what to suggest (as I'm still not sure I understand the
situation myself.) Perhaps something simple, like, "When layering multiple
pigments, they must first be wrapped in explicit individual texture{...}
statements." IMO, that would probably take care of the whole conundrum, from the
user's standpoint.

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