Silica gel is a granular, porous form of silica made synthetically from sodium silicate. Despite the name, silica gel is a solid. It is a popular desiccant used in many industries world wide. These Silica Gel beads will absorb moisture keeping seeds etc. fresh and free from excess humidity. It is recommended by horticultural experts that the equal weights of silica gel and seeds are used. This means one bag will help preserve around 50 cannabis seeds.