ThermaNin L scale metal or plastic materials and

metal or plastic materials and waxy surfaces such as candles or wax-paper milk cartons

Red Fluorescent Magnetic Powder

2 7/8" x 7 1/2"

40 and 80 degrees beam cone or a line of light using the 60 x 1 degree filters

ThermaNin L scale metal or plastic materials andThermaNin is a ninhydrin derivative for developing fingerprints on thermal paper. Regular ninhydrin and DFO solutions are either based on polar solvents (like acetone or ether) or contain them. These turn the top (active) layer of thermal paper gray or black. Japanese researchers have published that hemiketals of ninhydrin are soluble in petroleum ether (or other polar solvents like pentane, heptane) without the need for addition of polar solvents.