Handprint.com is a wonderful resource... I am often amazed that this fellow did all this work!
Here is his portion about toxicities:
http://handprint.com/HP/WCL/pigmt6.html#toxicity
But the whole site is really helpful about quality of brushes, pigments, paper, and manufacturers of watercolor products.
I can only manage a little bit each day.... it can be so overwhelming!
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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