Skip Sensbach writes at Ceramic Arts Daily:
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Iron is a common element that is found in most of the ceramic materials we use. From clay to glazes, we come in contact with iron on a daily basis, usually in the form of iron oxide. Iron is a useful and important element in forming the color of our clays and glazes as well as in some instances acting as a flux. For many ceramic artists, the need to add iron oxide to clay and glazes usually ends up with a phone call to a clay supplier to order several pounds of the material. The iron oxide is then shipped, possibly traveling over many miles before arriving at the studio. However, for artists who live in an area that has a history of mining, a more environmentally friendly source of iron oxide might be in your own back yard.