Orange silica gel is also known as yellow indicator, color-changing silica gel, the appearance of orange vitreous particles, with their own color after moisture absorption from orange to blue green or green characteristics. The color changes from orange to blue-green after moisture absorption to directly indicate the humidity in the environment. When the humidity of the external environment is about 30%, the color of orange silica gel does not change. When the humidity reaches about 50%-60%, the color of orange silica gel begins to change. When the humidity reaches 90 percent, the orange silicone quickly turns turquoise.