Gem Powders are our newest magnetic fluorescent powders. Black Ruby and Black Emerald appear to be simple black magnetic powders. They are applied to evidence and can be lifted just as regular black magnetic powders are. However, these Gem powders also fluoresce just as our red and green fluorescent powders do. You have the choice of using these Gem Powders as regular black magnetic powders, but you also have the choice of fluorescing them.
Having the same wide range of sensitivity as Red Fluorescent Powder, Black Ruby is is an excellent primary-use magnetic powder for examination of latent prints using portable lasers, Forensic Light Sources and ultra-violet light sources. Because of its nature, Black Ruby Magnetic Powder is excellent as either standard black dusting powder or a fluorescent latent print powder. It can be lifted just like any standard latent powder, but when the surface is too rough to lift the print, simply use your Forensic Light Source or laser to fluorescent the powder and photograph it. Black Ruby magnetic powder is very sensitive to 570-590mm wavelength light when viewed through a red filter.