Available in either the light or heavy form, it is a flux in high temperature glazes (up to 10%) used to produce a smooth buttery surface. Used in excess a semi-matt surface may be produced and very large quantities may cause pin holing and crawling. In low temperature glazes it reduces fluidity. Used in conjunction with cobalt and manganese it produces interesting colour effects. References to light and heavy magnesium carbonates actually refer to the magnesium hydroxy carbonates hydromagnesite and dypingite (respectively).
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