The factors influencing the color of Longquan celadon include the factors of the glaze itself and the factors of the external environment.The factors of the glaze itself are divided into influencing factors before the glaze layer is closed and the influencing factors after the glaze layer is closed according to the firing process,before the glaze layer is closed,a steady stream of reducing gas and the limited iron oxide particles in the glaze layer surface molecules for reduction reaction,the re-duction ratio is the ratio of divalent iron generated by reduction to the unreduced ferric iron determines the hue of the glaze,the factors affecting the reduction ratio include the fineness of iron in the glaze,the content of iron and the dispersion of i-ron,of which the iron content affects the hue of the glaze and the color saturation of the glaze;After the glaze layer is closed,the reducing gas can no longer enter the glaze layer,and the factor affecting the color of the glaze is the chemical composition of the glaze,that is,the alkali metal oxide and alkaline earth metal oxide due to the different binding ability of alkali metal and alkaline earth metal ions to oxygen ions,resulting in different degrees of free oxygen ions,so that the diva-lent iron ions are oxidized to ferric ions,that is,the reduction ratio of the glaze is changed,thus affecting the color of the glaze.External environmental factors include firing atmosphere,glaze thickness,iron content of embryo body,strength of reducing atmosphere,firing temperature,and trace coloring elements in porcelain clay.
Longquan celadonRestore the atmosphereColorFinenessIron oxide contentDispersionChemical composition
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