Color-changing silica gel possesses the adsorption and moisture-proof functions of fine-pore silica gel. Its characteristic is that during the moisture absorption process, it gradually turns light blue as the moisture absorption increases, and eventually changes to light red or light pink. It can both indicate the humidity of the environment and visually show whether it is necessary to replace the desiccant.

Color-changing silica gel is widely used for moisture-proof packaging in transformers, electrical cabinets, precision instruments, leather products, clothing, and household appliances. It can be used alone as a desiccant or in combination with fine-pore silica gel.