Silica Gels are used for dessication purposes (removal of moisture) in lab and sometimes in medicine bottles too. It absorbs moisture/water and changes color from it original color to blue/greenish depending on composition of silica gel. read more
Silica gel is a dehydrating agent and is used to absorb moisture, when we drop it into the water it absorb water, become saturated and changed its color. After drying it regains its orignal crystal form. read more