Our Red fluorescent powder fluoresces strongly when viewed under 450 nm, 485 nm, 525 nm, 530 nm and 570 nm wavelengths of light. It is applied just as any powder is dusted, using a Feather Duster. If you have a forensic light source, try using the 570 nm setting and view the print using red goggles. For everyone else, we suggest you use the red powder with our forensic blue flashlight, in order to see dramatic results. Includes two jars of 1 oz powder.