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Old Wired issues made great use of spot metallics, neons, and UV too.

Their “wrong theory:” https://www.wired.com/2014/09/wrong-theory/

back in the early 1980s when every article in Scientific American had illustrations in black, white and one other color which varied with the issue

Oh that sounds lovely! And potentially a useful memory aid: "I don't remember when I read it, but I think it was in a dark magenta issue…"

> who would draw a laboratory setup including a stool and I knew he knew exactly how to build the stool.

I love that about illustrators. A decent illustrator is also simultaneously an engineer and a designer.

And every good engineer was once also a decent illustrator. Such skills are less respected these days as we draw so many lines between art and engineering. Few if any recent engineering grads could freehand a simple image of a bird.