Powders and brushes on the CBI latent-fingerprint lab Powder (for nonporous surfaces): Metallic silver powder or velvet black powder A CSI works by using whichever powder contrasts most with the colour of material holding the print. He gently brushes powder on to the surface within a circular movement till a https://tituswbejm.life-wiki.com/667201/crime_scene_fundamentals_explained