Silica Gel packaged in Cotton is the industry standard for dry food packaging. When used in closed places where mold, mildew and fungus live and breed Silica Gel whisks away moisture to create a protective environment of dry air, Silica Gel is used to prevent tarnish on gold and silver, in your toolbox to protect your precious tools from rusting, or drop some in your camera bag to protect your camera and equipment, Packets contain silica gel which is a non-toxic and inert moisture absorber. It prevents all forms of rust, corrosion, oxidation, mildew, fungus, mold, fogging, etc.