Crystal Violet, 25 Grams Use Crystal Violet to develop latent fingerprints on the adhesive side of almost any kind of tape, e.g., Scotch, electrical, Kraft, etc. Mix the powder in water, soak the tape in the solution and rinse with running tap water. The caution about working with Crystal Violet powder or solution is that it is a very messy dye and will stain skin, clothes, floors and counter tops. It may be very difficult, if not impossible, to remove the stains from some clothing, furniture and floor covering. Crystal Violet is also often used as a "theft detection powder." The item is first VERY lightly dusted with the powder and when the item comes into contact with moisture (for example, the thief's hands), it turns dark purple and stains anything that comes into contact with it. However, this use is NOT suggested due to the messy nature of the product and the fact that the stains DO NOT come out of most surfaces. NOTE: More Info in the Long Description Shelf-life of Crystal Violet powder: indefinite. The working solution should not be kept much longer than 3-6 months. While older solutions may continue to work, the results might not be as good.

Inkless Tab Kit #3878 for Banks This kit allows the user to quickly and cleanly take single fingerprints for security and identification purposes. Utilizing our unique I.D. Print ® system, the individual simply presses their finger into the included inkless fingerprint pad. No residue or ink is left on the fingers. The individual then presses their finger onto one of the chemically-sensitized tabs. A permanent, black print develops and dries immediately on the tab. Ideal for use at banks and retail establishments as a fraud deterrent. Each kit includes a round, yellow inkless I.D. Print ® fingerprint pad and 500 chemically-treated tabs.