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The Sherlock lead test kit is one of the only products on the market that is an all-in-one solution. You don't need anything else--no water, no vinegar, no chemicals--to make this lead test work for you. Just snap the tip and test. If the swab turns pink or purple, you’ve found lead. Sherlock also knows you’ll want to test a variety of surfaces and objects, so we include 40 test swabs for your convenience. The ingredients of the Sherlock lead test swab are as follows: Rhodizonic acid, disodium salt, water, polypropylene, acetic acid and cottonseed oil. Warning: if you swallow the liquid in this test kit, seek medical attention. If you get it in your eyes on your hands, flush with water.