IRON OXIDE— SYNTHETIC RED
Iron Oxide—Red
Iron oxides and oxide hydroxides are widespread in nature and play an important role in many geological and biological processes. e.g., as iron ores, pigments, catalysts, in thermite (see the diagram) and haemoglobin. Common rust is a form of iron (III) oxide. Iron oxides are widely used as inexpensive, durable ceramic pigments. Colours commonly available are in the "earthy" end of the yellow/orange/red/brown/black range.
Iron Oxide - Synthetic Red Fe2O3 Ferric Oxide (BA490)
This is very fine and produces more even shades from honey to dark red browns (2-10%).
The final colour obtained with iron oxide varies with the type of glaze, firing temperature and kiln atmosphere.
Iron oxide is also an active flux in glazes and even in small amounts will make a glaze noticeably more fluid.