FSC239Y5 Lecture Notes - Lecture 28: Fingerprint Powder, Exothermic Reaction
Document Summary
Snow impressions: fingerprint powder - granular fingerprint powder. For photography purposes mostly - little bit of enhancement: snow print wax. Looks like pancake mix - add water and mix. Used for lifting tire marks or shoe print impressions: differences between dental stone and sulfur. Liquefying sulfur, heating it - 116 degree c melting point. But more inconvenient to cook on outdoor stove so typically use dental stone. 3d and sand: dirt, mud, sand, soil, enhanced by. Flashlight or off camera flash at different angles: parting powder. Not normally used in field - just cast and hope for the best. It"s a separating agent, won"t stick to sand, will come out much easier. Then pour dental stone on: why do you use flower sifter in forensic application. For footwear or tire track impressions that are underwater. Exothermic reaction so its curing - doesn"t evaporate - will still set. Apply right on water, and will fall down onto impression.
