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變色硅膠具有細孔硅膠的吸附防潮作用，其特點是吸濕過程中，能隨吸濕量的增加變成淺藍色，最后變成淺紅色或淺粉色。既可指示環境的濕度也可直觀顯示是否需要更換新的干燥劑。

Blue silica gel has the adsorption and moisture-proof effect of narrow pore silica gel, It is characterized by the moisture absorption process, it can become Light blue with the increase of moisture absorption, and finally become light red or light pink. It can indicate the humidity of the environment and also visually show whether a new desiccant needs to be replaced.

變色硅膠廣泛用于呼吸器、變壓器、電柜、精密儀器、皮革、服裝、家用電器的包裝防潮，可單獨做干燥劑使用，也可以與細孔硅膠配合使用。

Blue silica gel is widely used in respirators, transformers, electrical cabinets, precision instruments, leather, clothing, household appliances packaging moisture-proof, can be used as a desiccant alone, can also be used with fine silica gel.