These three melt flows and mugs were fired at cone 6 (using the C6DHSC firing schedule). The recipe is GA6-B (80% slip, 20% Ferro Frit 3195). The center flow and mug (M340) employ original Albany Slip in the recipe. The one on the far left uses an Albany Slip substitute that was developed by calculating a mix of RedArt and other materials to have the same chemistry as Albany Slip. The one on the right employs Alberta Slip but adds 1% iron oxide. It is apparent that Alberta Slip needs a little iron oxide to best match the original Albany (likely a 2% addition would have been about right). The chemistry of RedArt is different enough from Albany that some compromises in chemistry-matching were needed to avoid over-supplying the iron. This produces a glaze, that although flows as much, is not quite as glossy at cone 6 (at cone 7 it is more similar).