A: All of our products are subject to rigorous safety testing and evaluation using EN71 & ASTM standards. Our Art Materials including all crayons,clay and paints are tested to conform to CE standard, LHAMA D4236 which identifies a product as being NON-TOXIC.By the age group specified on the package, it indicated either “Conforms to D4236”, or “Conforms to ASTM F963”. This means that a comprehensive Toxic Risk Assessment (TRA) of the product ingredients has been performed by a certified toxicologist and confirmed to be non-toxic to the user. Your assurance that they are safe for use.