White Silica Crystals has good absorption capacity; but it donot have any indicator. When free from moisture the particles are transparent white, but after use they turn little milky or hazy white. Used as desiccants,moisture adsorbent,dehydrating agent and rust inhibitors.Available in mesh sizes of 1-2 (9-12mm), 3-4 (6-8mm), 5-8 (4-6mm), 9-16 (2-4mm), 16-30