Product: Blue Silica Gel Size: 1-8mm Color: Changeable, Blue to Pink Our factory can produce various size range of silica gel blue color changable.We can supply high quality silica gel blue color indicator with various size range,the color can change to pink .According to the different pore diameters of silica gels, these products are categorized into large pore silica gel, macro-pore silica gel, ...