3M™ LeadCheck™ Swabs are EPA recognized, non-toxic and provide an instant test for lead on most surfaces, including wood, ferrous metal (alloys that contain iron), drywall and plaster. When lead is detected, 3M™ LeadCheck™ Swabs and/or the surface being tested turns pink or red depending on the concentration of lead present. In the vast majority of test situations results are obtained in less than 30 seconds. When detecting low levels of lead, or lead chromate containing pigments, results may take longer to develop. Each kit contains test confirmation cards to verify individual test results. Since their introduction in 1992, 3M™ LeadCheck™ Swabs have been used to detect lead under a wide variety of field test conditions. Recognized by industry professionals for superior accuracy and sensitivity, 3M™ LeadCheck™ Swabs have outperformed other screening methods in every government evaluation conducted over the past 15 years.