Safe Art Materials, links to many articles on this important subject ! :)
Here is a link to an article on Safe Art materials, from the National PTA.
and this article from the Office of Environmental Health Hazard Assessment
and this one from the School of the Art Institute of Chicago
And lots of info from the Arts and Creative Materials Assoc (the people that sponsor YAM -Youth Art Month)http://www.acminet.org/Safety.htm
Hope this helps, Christine Besack :)