Prang Metallic Art Markers feature superior ink formulation that lends metallic luster to a variety of bold colors. Ideal for dark paper, glass, wood and metal. Durable bullet tip delivers both fine and broad lines. Markers are safe for use on archival projects. Ink is washable, odorless, acid-free and won't bleed through paper. Certified AP nontoxic and conforms to ASTM standards.