Abstract
The fireworks glaze of Lushan speckle porcelain (618-907A.D.) is a type of multicolored glaze that applies a surface-glaze (such as blue, gray-white glaze, etc.) on top of a black bottom-glaze. Its coloring mechanism was determined by using XRF, XPS, XRD, Raman, and SEM to study how its coloring was affected by its chemical composition, Fe valence state, crystal, phase-separated structure, and glaze flow. The results showed that the beige glaze was produced via oxidation and corrosion, and its color was mainly due to its high Fe3+ content and the gel layer. Dark blue and light blue glazes had a higher Fe2+/Fe3+ ratio, and the amorphous structure color of the dark blue glaze deepened its blue tone. A higher CaO content and droplet sedimentation made the dark blue glaze more fluid. The low miscibility between the surface-glaze and bottom-glaze and bubble movement made different-colored glazes merge to form fireworks patterns.
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