Silica gel is a granular, vitreous, highly porous form of silica made synthetically from sodium silicate. Despite its name, silica gel is a solid. It is a naturally occurring mineral that is purified and processed into either granular or beaded form. As a desiccant, it has a strong affinity for moisture molecules.
The crystals are transparent white. On absorption of moisture, the particles turns milky. White silicagel has the higher moisture absorption capacity than indicating type silicagel.
Silicagel Blue (Indicating Type)
Indicating type Silica Gel (Blue) is semi-transparent glassy granules containing Cobalt Chloride as indicatort. When free from moisture, the granules are dark blue in color. On moisture absorption, the granules turns to light blue gradually & then to pink. It indicates that the gel needs to be replaced. Blue Silica Gel is also know as Indicating Silica Gel, Self Indicating Silica Gel, Blue Desiccants.
Silicagel is available in bulk quantity as well as in sachet/pouches of 1gm, 2 gm and 5 gms.