Lightning® black powder is noted for its coal-black hue and its property of adhering to the latent print but not to the background surface. It is a heavy powder which will not float around in the air and "dust" the technician as well as the print. Lightning® black powder is recommended for most general dusting situations. Lightning® silver/gray powder is recommended for use on all glass, metallic, highly-varnished surfaces, hard rubber, safes, and blue-steel guns. Lightning® white powder is useful when greater contrast with a dark-colored background is desired.