Marsh 88FR Black Markers #M88-BKD contain long-lasting marker ink that withstands the demands of the toughest industrial environments and applications. These markers are manufactured specifically for industrial use. Black Markers #M88-BKD are permanent on most surfaces including metals, plastics, wood, glass, corrugated and shrink film. These markers use a reversible bullet/chisel nib of acrylic fibers. Dry times are dependent on humidity, ambient temperature, and substrate surface temperature, but generally range from 45 to 60 seconds.