Turns any container into a desiccator. 84855-00 Indicator bag’s gel shows when moisture capacity has been reached. Window bag has one side of clear film and one of white Tyvek®. It contains a blue indicating gel, which turns to pink when the desiccant has reached its moisture capacity and needs to be replaced. It cannot be regenerated. 84855-01 has white Tyvek® on both sides, and may be regenerated and reused continuously. Regeneration requires heating in an oven at 220°F. Included in each pack is a Relative Humidity Card, which changes from blue to pink to show when the bags need to be regenerated. Ideal for storing food/pharmaceutical samples, electronics, PC boards, optics, chemicals, and equipment. Bags are certified as Class M3.5 (formerly Class 100) clean room-compatible. As a benchmark, one bag will maintain dry conditions in a container with a volume of two gallons (476 cubic inches).Typical results are 37% moisture absorption. Each bag measures 3 x 3 x 1/4 inches and weighs 10 grams.