Copper red reduction glaze at cone 9 reduction

The color red is difficult to achieve in ceramics. In reduction firing copper can turn many dazzling shades of red.

Articles	Copper Red Glazes A study of the mechanism behind the color in color red glazes by Karl Platt.
Materials	Copper Oxide Black The purest source of CuO copper oxide pigment used in ceramic glazes.
Glossary	Copper Red The color red is very difficult to achieve in ceramics. The most vibrant red within the reach of the average potter is the color produced by copper in reduction firing.
Glossary	Reduction Firing A method of firing stoneware where the kiln air intakes and burners are set to restrict or eliminate oxygen in the kiln such that metallic oxides convert to their reduced metallic state.