| Monthly Tech-Tip  | No tracking! No ads!  | 
Some of the clays we mine have contain natural ironstone concretion impurities, they melt and blossom to produce speckle when fired in reduction in a gas kiln. Both of these are made from locally mined clays ground to 42 mesh. The one on the left is H550 and the one on the right is a mix containing Plainsman Fire-Red and A2 clays. The glaze is GR10-C, an MgO matte recipe based on Ravenscrag Slip.
| Glossary | 
Reduction Speckle
 A sought-after visual effect that occurs in reduction fired stoneware. Particles of iron pyrite that occur naturally in the clay melt and blossom up through the glaze  | 
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