Cone 5-6. The Potter's Choice series is a collection of potters' favourite glazes made easy. These glazes are fired in an oxidation kiln. They are made for anyone who would like to achieve the Cone 10 reduction effects without having to have a reduction gas kiln or firing at that high temperature. The PC Series glazes look beautiful and authentic. They work well over any stoneware or porcelain clay body at either cone 5 or 6.