Blue silica gel, a type of desiccant, is used for moisture absorption and preservation in various applications, including electronics, pharmaceuticals, food packaging, and industrial processes, with its color change indicating moisture saturation. Self-indicating silica gel is a moisture-absorbing desiccant featuring color-changing properties to signal its saturation level. Unlike standard silica gel, it incorporates cobalt chloride or other moisture-sensitive indicators that shift in color, typically from orange to green or blue to pink, when maximum absorption capacity is reached.