Address P.O. Box 219 Batavia, IL 60510
Phone 800-452-1261
Fax 866-452-1436
Email [email protected]

November 05, 2016

Indicator Sponge illustrates how indicators work. During the demonstration, a red sponge is placed in a red solution and it comes out blue, while the blue sponge turns red when it is placed in a blue solution.