Tel-TaleŽ Bulk Desiccant 5-Lb Cans. The indicating silica gel is a lustrous royal blue color when it is fresh. As it adsorbs water, the color changes to light blue, then pink, and then almost colorless. This color progression provides a relative indication of the degree of saturation of the silica gel. The product is reusable and will change back to a deep blue color when reactivated at 125° to 160° C. These products are actually bulk, not packaged, desiccants. The steel can has a friction fit lid for a highly effective moisture barrier, ensuring that the desiccant remains active until you are ready to use it. The small package size is ideal for applications where one doesn't need a large volume of desiccant, such as small air dryers, lab desiccators, etc. This helps to ensure product integrity while minimizing the waste associated with large containers. Offered here in a convenient 1-gallon, 5-Lb steel can.