The US Public Interest Research Group Education Fund has found asbestos in crayons. The agency conducted tests on six brands of crayons sold at Dollar Tree. Five of the six brands passed, with the exception of Playskool. Dangerous amounts of Tremoline were detected inside of their green crayon. Tremoline is a type of Asbestos, and exposure to this harmful chemical can cause life threatening complications such as lung cancer, mesothelioma, and others.