Plainsman Coffee Clay

Mid-Fire Coffee Black is made from a base similar to H550 with a 10% addition of burnt umber (a calcined naturally occurring pigmented clay). The umber colors the fired body and matures it enough for functional ware at cone 5. Coffee Clay is smooth and easy-to-throw.

We rely on the consistency of burnt umber to maintain the maturity, color and speckle development. Umber is a heavily pigmented raw clay that is maintained for staining cement, mortar and paint (for ceramics we must tolerate some variations e.g. particle size, chemistry). You may see differences in the pugged or bisque fired color from run to run, this happens when we have to change suppliers or grades of the umber product - however the fired color at cone 6 will still be normal.

Process Properties
This clay is plastic, it throws and forms well (even if soft). It generates plenty of slip on throwing and is smooth.