Blue silica gel has the adsorption and moisture-proof function of fine-pore silica gel. Its characteristic is that during the moisture absorption process, it turns purple and then light red as the moisture absorption increases. It can indicate the environmental humidity and visually show whether it is necessary to replace the silica gel with a new one or regenerate it for reuse.

Blue silica gel can be used alone for moisture absorption. Due to its color-changing feature, it is often used in combination with ordinary silica gel desiccants to indicate the moisture absorption level of the desiccant, thereby determining the relative humidity of the environment.

Blue silica gel is widely used for moisture-proof packaging of precision instruments, leather, clothing, food, and household appliances.