Some ceramic products by burning oil and can be used on the brick planter WATER FILTER. But most products, ceramics after sintering raw then be coated with a coating which is a mixture of molten silicate with agents and other additives, heat or called. Glaze (Glaze firing) to make glaze coated fused together into a homogeneous product with ground beef. When cooled, it looks like a thin glass stick coating on the surface of the product, making the product with the skin looks shiny resistant to scratches. And other properties as needed.
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