Due to extreme weather, the Flinn Warehouse is not shipping today, 1/23/2026. We expect to resume normal shipping on Monday, 1/26/2026. We regret this inconvenience. For more information, please call us at 800-452-1261.
Color change of pink to a deep purple-red indicates the presence of lead in solutions or on surfaces. Limits of sensitivity: 0.05 micrograms on surfaces, 5 milligrams/liter (5 ppm) in solutions. The presence of as little as 50 ppb in solution can be determined by using evaporation techniques. Forty 25 x 40 mm size sheets.