Description
Sudan Black is a dye that stains the fatty components of sebaceous secretions to produce a blue-black image. While it is less sensitive than some other latent print development techniques, it is particularly useful on surfaces contaminated with greasy or sticky substances. Use on nonporous surfaces such as glass, metal or plastic materials and waxy surfaces such as candles or wax-paper milk cartons. It is easy-to-use, inexpensive, non toxic, and has an indefinite shelf life.