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usually colorimetric
A turquoise color reaction on the Collection Paper indicates a positive reaction
the colorimetric scheme will produce a cream color to indicate the presence of amphetamines or narcotic alkaloids in the subject
SPR Black overcomes past problems by incorporating product modifications
Coca-Test - Drug Detection Aerosol Explosive Detection usually colorimetricCoca Test is an aerosol based field test kit for the detection and identification of Cocaine, Crack, and PCP. Coca Test contains a patented modified Cobat Thicyanate (Scott) reagent. Using Mistrals Collection Paper (#530, Grey), simply wipe the suspected surface or touch the substance and spray with Coca Test. A turquoise color reaction on the Collection Paper indicates a positive reaction. Aerosols are the fastest and easiest to use presumptive drug
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