To provide a a glass composition which can be used for a dental porcelain or a dental ceramics coloring material, and has low temperature meltability, acid resistance and preservation stability under the humid environment which are required for a dental porcelain or a dental ceramics coloring material, and a dental porcelain and dental ceramics coloring material which contain the glass composition of the present disclosure. To provide a low melting glass composition with softening point (Ts) less than 600 °C comprising as a component； SiO2: 55.0 to 75.0 wt.%, B2O3: 6.1 to 12.0 wt.%, Al2O3: 2.0 to 8.0 wt.%, ZnO: 2.0 to 85 wt.% and two or more kinds of alkali metal oxide: 10.5 to 20.0 wt.%.
