Arrowhead Forensics Red Fluorescent Magnetic Latent Fingerprint Powder 2oz Base Layer Tops Two Layers Size Waist x Inseam in Inches:34 x 34 Two Layers It's been speculated the sheepfoot shaped blade originated with mariners who found the rounded tip especially beneficial when the knife was accidentally dropped (think working on a ship in pitching seas) as it couldn't stab the foot when hitting the deck Developed for use with any number of alternate light sources ranging from small 1 watt ultraviolet lights to multi watt lasers convenience store counters and multi colored non porous items where normal conventional powders may paint or clog the surface