Store › Plainsman Stoneware Clay - M340s Plainsman Stoneware Clay - M340s $44.99 This M340S is the same as M340 with added manganese to give a brown speckle in oxidation firing. This M340S is the same as M340 with added manganese to give a brown speckle in oxidation firing. Add To Cart Added! You Might Also Like Mid Smooth Stone Speck Stoneware Clay $49.99 Plainsman Earthenware Clay - Snow $69.99 Bright White Porcelain Clay $59.99 Smooth White Stoneware Clay $59.99 Smooth Raku Clay $59.99
