Reduction Speckle
An effect created by firing a clay containing high iron mineral particles (e.g. ironstone concretions, etc.). The iron becomes a flux in reduction and the particles melt and blossom and can even run down vertical surfaces. Plainsman Clays in Alberta, Canada is particularly adept at making this type of body because they have raw clays that contain concretions and their grinding process can leave them large enough to blossom and consistent over time. In Bound Links
Pictures
Cone 10R dolomite matte glaze with 5% manganese dioxide
Dolomite matte glazed cone 10R mug courtesy of Susan Clarke.
A cone 10 reduction stoneware clay containing iron stone concretions ground to 20 mesh
An example of how iron stone concretions contained within two clay bodies (a white and brown stoneware) blossom and produce speckle at cone 10 reduction.
Example of mugs with different outside glazes fired to cone 10 reduction (mug on right is brown iron stoneware, others are buff stoneware bodies).
Cone 10R firing of Plainsman FireRed (left), St. Rose Red 42 mesh (center) and St. Rose Red 10 mesh (right). The 10 mesh material produces a reduction speckle and deep red color that is very unique.
Ravenscrag Saskatchewan clays fired at cone 10R (top) and at cone 10R with glaze (bottom): A1, A2, A3, 3B, 3C, 3D. The bottom row has also shows solubles salts (SOLU test).
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