An ingredient that reduces transparency or makes the product opaque.

Minerals which are included in glaze recipes to render them opaque, such as tin oxide, antimony oxide, zircon, zinc oxide and titanium, along with zircopax, opax and ultrox. As a general rule add 15% opacifier to the batch except when using tin oxide use 5%.

A material used to whiten a glaze or make it opaque.

Opalescent glaze Opaque

A relatively insoluble glaze substance. Minute particles reflect light and render the glaze opaque.

Opacifier - A substance added to a material in order to make the ensuing system opaque. One example is Tin oxide (SnO2), which is used to opacify ceramic glazes.