Cocaine Purity Test KitUse the Cocaine Purity Test Kit to get a good idea about the purity of your cocaine. It requires a small sample (you only need 20 mg of cocaine). Simply compare the test result with the color chart included with the kit to get a good idea about how pure your cocaine sample is. Cocaine Purity Test Color Chart Image of the Difference in Purity of Cocaine Samples The results from the tests done above can be read as follows: The first ampoule (where the