These watercolours have been third party tested by the toxicologists at Duke University and Cambridge Materials testing to meet and exceed the standards for safety for childrens paint. they are not toxic or hazardous and meet LHAMA and ASTM D4236 standards for artist materials! Through this process they have earned the right to bear this seal. They are also made with our same dedication to lightfastness and quality and are identical to our other paints for fine artists. We believe artists of all ages even those in kindergarten deserve the joys that handmade paints can bring! And knowing that their safety has been considered to the highest degree!