Which among the following substances is not a component of the mixture used for glazing pottery?

Feldspar

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Silica

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Borax

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Alumina

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Solution

The correct option is A Feldspar
Ceramic glaze is an impervious layer or coating of a vitreous substance which has been fused to a ceramic body through firing. Glaze can serve to colour, decorate or waterproof an item.

Pottery glaze is made up of five basic components. These components are silica, alumina, flux, colourants and modifiers.

Hence, option A is correct.

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