Candy or cake packaging, often with a small bag of desiccant, marked with "not edible" message. People generally will readily dispose of trash; or even out of curiosity, ripped look, see and capsules of small beads. This is the widely used silica gel desiccant.

The main ingredient of silica gel desiccant is sio2, a highly active adsorption material that contains numerous cavities, spongy, can absorb moisture.

In addition to make the food dry, silica gel desiccant has another magical. When planting, pour out the silica gel mixed with the soil, can be used as fertilizer to use. The main component of silicone is Silicon, with the promotion of the effectiveness of plant photosynthesis.