won’t dry out leave cap off up to -1/2 hour!! bold marking, permanent ink provides high visibility. Marks on virtually any surface, including cardboard, metal, and plastic. Quick drying; water and rub resistant. Durable chisel tip 3/16 marks in a variety of widths. Low odor. Acmi certified to meet federal standards of nontoxicity; safe for office, school, or home. Conforms to astm d4236.