Luster

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Luster

In numismatics, the shininess of a coin. Coins in mint condition have the greatest luster. As a result, coins with a great deal of luster may have the most value.
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i) Study of the relative importance of the various factors like (a) strength of colorant; (b) dispersion and stability (c) method and thickness of application (d) glaze composition and (e) fringe factors such as rate atmosphere and temperature to control the development of hard luster glazes
Acid Tests: Luster glaze effects produced from glazes Nos.
In both cinnabar and sulfur containing mixtures different reactions involving sulfur can enrich the reducing atmosphere with the formation of sulphure dioxide gas (SO2) directly in the luster layer aiding the final reduction and formation of the metal nanoparticles.