Iron Oxides (172) are insoluble mineral are red, yellow and black colours. They are highly stable and cost effective. They are used in bakery, extruded foods, confectionery, dairy products and pharmaceuticals.
Stability
| Light Fastness | Good |
| Temperature | Good |
| SO2 Resistant | Good |
| Colour at pH | |
| pH 3 | n/a |
| pH 5 | n/a |
| pH 7 | n/a |
| pH 7-9 | n/a |