Blue colloidal silica indicator divided into blue, colloidal silicaand bluecolloidal silica , blue or light blue glass-like appearance of particles, according to the spherical particle shape and bulk can be divided into two, the role of moisture adsorption with colloidal silica , and With the increase in moisture content, their color changes from blue to purple, and finally into a light red, indicating both the humidity of the environment, but also the role of visual display is still damp. 1 is mainly used for equipment, instruments, equipment, etc. under the conditions of moisture absorption in sealed rust. (2) used in conjunction with ordinarycolloidal silica desiccant, indicating desiccant to absorb moisture level and to determine the relative humidity of the environment. Packed with colloidal silicaas a desiccant, widely used in precision instruments, leather, clothing, food, medicines and household appliances.Read more：http://www.chemical-chem.com/Papermaking-chemicals/Colloidal-Silica/
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