熔块 Frit

熔块是一种玻璃。由一定的原料组成，经高温融熔骤冷而成；具有不可溶性、稳定性等特质，经研磨后施于各种器皿上，烧制后成一薄层的玻璃质。

Frit is a type of glass. It is composed of certain raw materials and made by high temperature melting and quenching; It is insoluble, stable and so on. After grinding, it is applied to various utensils. After firing, it becomes a thin layer of glass.