Absorbent Industries 20-Pack Indicating Silica Gel Packet, 1/2gm Dry-Packs Indicating Silica Gel Packets Provides Superior Absorption While Remaining Dry At Maximum Saturation Indicating Silica Gel beads will change from Orange to Dark Green once Silica Gel is at 60-percent moisture capacity and needs to be replaced 20-1 Gram Indicating Silica Gel Packets; Perfect for your everyday moisture absorption needs Can help prevent Mold, Mildew, Corrosion and Fogging