It is translucent glassy spheric bead, sky blue in the moisture-free state after high temperature activated when getting out of the factory, turning light red from outside to inside after absorbing moisture and whole light red after saturation. So it not only has the same water absorbability and humidity resistance as the spherical silica gel, but also has the after indication function. It is sorted into reagent-grade 500g/bottle and industrial grade moisture-proof packaging. It can be recycled after being heated at 150 for continuous 2 hours.