Oregon Revised Statutes Public Health and Safety § 453.225

For the purposes of ORS 453.205 to 453.275, an art or craft material shall be presumed to contain an ingredient which is a toxic substance causing chronic illness if the ingredient, whether an intentional ingredient or an impurity, is one percent or more by weight of the mixture or product, or if the Oregon Health Authority determines that the toxic or carcinogenic properties of the art or craft material are such that labeling is necessary for the adequate protection of the public health and safety.