3M LeadCheck Swabs are EPA recognized, non toxic and provide a rapid test for lead on most surfaces. When lead is detected, 3M LeadCheck Swabs turn red on contact. The vast majority of test situations results are obtained in less than 30 seconds. Simple to use: just crush, shake and swab. RED MEANS LEAD! Each kit contains test confirmation cards to verify individual test results. 3M LeadCheck Swabs provide instant lead detection results for quick and accurate job pricing. In just seconds, you will know if lead safe practices are required. Test for lead on surfaces such as: painted surfaces, steel structures, vinyl and other plastics.