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 Plainsman Stoneware Clay - M390 $49.99 Plainsman Stoneware Clay - Coffee $74.99 Laguna Bob's Tile and Sculpture Paper Clay $75.99 Mid White Stoneware Clay $49.99 Blackstone Stoneware Clay $69.99
