ASTM D-4236 is a standard developed by the American Society for Testing and Materials that ensures art materials are safe for use. It requires manufacturers to evaluate their products for potential hazards and to label them accordingly. This helps consumers make informed choices about the materials they use, especially in art and craft projects. When a product is labeled as "ASTM D-4236 compliant," it means it has passed the necessary safety tests and meets the guidelines set forth by this standard. This compliance is particularly important for products used by children or in educational settings, as it promotes safer creative environments.