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Iron Oxide, Spanish Red
Addtime: 2017/02/15 Read:2628 Font size: Large Small
Iron Oxide Red is the normal state of iron oxide. It is the most oxidized form, and when it is reduced, it is reduced to iron oxide black. This chemical is 81% Fe2O3, and is bright red in its raw, powdered form. As a glaze component, it can create varied effects depending on the conditions. In general the following occurs with iron oxide:
oxidation firings produce iron oxide red
reduction firings produce iron oxide black
The amount of iron oxide present in a glaze will affect the colors as well. Iron oxides can be used in slips and washes and can also be applied directly to the clay body surface, a technique often employed to create a textured appearance. Suggested concentrations of iron are as follows:
0.5- 8% in slips
up to 15% in glazes
Because the ranges of concentrations are so broad, we recommend that you consult one of the many useful glaze recipe books that are available for reference.
In its powdered form, iron oxide red can cause skin, eye irritation and sensitization, and is very harmful if inhaled. Please use protective coverings when handling this chemical.
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