August 6, 2010, Newsletter Issue #407: Bone ash as an opacifier

Tip of the Week

Bone ash is used in glazes as an opacifier. It can be used to assist tin oxide so that less tin oxide is required, especially where a less shiny surface is acceptable. It creates an attractive soft mottling and also encourages the glaze to flow away from modelled high spots making relief decoration more effective.

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