Colored glass balls: colored glass coloring agent added after the show refers to the different colors of glass. Is joined with ordinary glass coloring agent, such as adding MnO2 purple; CoO, Co2O3 firing purple; FeO, K2Cr2O7 firing green; CdS, Fe2O3, SB2S3, burning yellow; AuCl3, Cu2O firing red; CuO, MnO2, CoO, Fe3O4 firing a mixture of black; CaF2, SnO2 firing white. Coloring dose the amount of melting time and melting temperature will affect the firing of different degrees of color depth. Use of colloidal colorants, such as gold, silver, copper, selenium, sulfur, etc., so that very small particles suspended in the vitreous body, so that the glass coloring. In the firing process, no matter what kind of coloring agents are added flux. 
 Colored glass, also known as heat-absorbing glass to absorb the sun's visible light, reduced the intensity of sunlight, the glass absorbs the sun's rays at the same time its temperature rises, heat up prone to cracking. 
 Colored glass is solid sol.