Dolomite Matte
Reduction fired cone 10 glazes that have a pleasant-to-the-touch silky feeling matte surface. This surface is a product of localized phase changes in the glaze melt associated with the sudden melting of MgO particles (discontinuities in the melt produce discontinuities in the glaze surface, this produces the pleasant silky feel). Since dolomite normally sources some or all of the MgO, these are often called dolomite mattes. Since this unique surface effect is a product of MgO sourcing minerals melting at a specific temperature, it is not possible to reduce the firing temperature of a specific dolomite matte. Rather, it is more practical to use mechanisms that produce the same surface effects at the intended temperature (e.g. refractory powders in fluid base, minerals that resist dissolution in the glass and melt suddenly at the intended temperature). Actually, MgO is a refractory at lower temperatures, so it can play a part in the development of these surfaces, but as a different mechanism.
Many dolomite matte glazes are improperly formulated and are not melted enough or have high percentages of feldspar and craze. Out Bound Links
In Bound Links
Pictures
Dolomite matte glazed cone 10R mug courtesy of Susan Clarke.
Classic dolomite glaze at cone 10 reduction on a speckle producing clay body (10R). The magnesia flux in dolomite creates a silky matte surface.
Cone 10R dolomite matte glaze with 5% manganese dioxide
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