**We recommend bisque firing SLOW speed between ^06 and ^04 and always SLOW speed glaze firing. If you are having trouble getting some brands of commercial glazes to not pinhole you can always try bisque firing to ^03. If you are using Mudworks glazes exclusively you only need to bisque to ^06 unless you prefer a higher bisque. A nice super smooth, plastic body that fires a dark chocolate brown at cones 5-6. Matures cone 5-6. Won't bloat at soft cone 7 if fired slow through the last 300-400F. Contains no grog. Gives nice warmth to glazes, giving that reduction look to them in oxidation. *Our tests with our Super clear glaze gave us little to no bubbles or green tint to the clear glaze. Contains less than 2% Manganese. Shrinkage 15% Abs at cone 6 less than 0.5% If you are interested in purchasing 300lbs + please email us directly for freight quotes Purchasing tips! If you are buying in small quantities to be shipped, check out our Flat Rate option for great shipping rates! Click here: https://kymudworks.com/collections/25-clay-delivered-one-flat-rate/products/25-clay-free-shipping?variant=42381900644602