A specialized glaze, Oxblood contains a chemical that causes it to reduce locally, producing a true copper red in your electric kiln without a special firing. Because of the way this glaze works, it needs to be very thick to produce the red color. Thinner spots will be clear or grayish. One of our most varied series, the Copper and Iron Glazes provide beautiful, traditional looks for ceramic wares. They each have their own properties, but most are durable enough for functional ware.