OK, here's what I could find (so far) in answer to the ASTM question:
Most art supplies are labeled with the voluntary hazard rating, (Conforms to ASTM D-4236), which requires a warning on art materials that pose a chronic hazard. Conforming to this standard means that the product has been tested and that the labeling will say whether or not the product contains toxic substances. If the labeling says "rated non-toxic" or lacks any warnings, it is suitable for use by children. If the labeling contains the words "warning" or "caution", it is not suitable. When a company hasn't opted to use the rating system, it's safest to consider the material toxic, or contact the company for more information.
And also this:
Under the U. S. Labeling of Hazardous Art Materials Act (LHAMA), all art materials sold in the U. S. must be evaluated by a qualified toxicologist and labeled, if necessary, for chronic toxicity according to the chronic hazard labeling standard, ASTM D 4236. LHAMA, which went into effect November 18, 1990, amends the Federal Hazardous Substances Act (FHSA) to require art and craft materials manufacturers to evaluate their products for their ability to cause chronic illness (such as cancer) and to place labels on those products that provide health and cautionary information and safe use instructions. FHSA already required manufacturers to evaluate and label for acute toxicity.
Hope this helps a little.
Gip
P.S. That'll be $75, please!
GW