Tel-Tale® 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.