From his website --
"I also enjoy the process of making forms with coils and over the last 5 or 6 years have been making some medium sized vessels that are inspired largely by African pottery and to a lesser extent Neolithic Chinese pots. Many of these are stained with iron oxide and coated with a clay and wood ash slip."
He uses stoneware and fires a gas kiln in reduction. http://www.rickhintzepottery.com/
An iron oxide wash can be made with red iron oxide, either gerstley borate or a ferro frit, and water. The gerstley borate/frit help the red iron oxide melt so it does not rub off. Many apply the red iron oxide wash during leather hard stage; others wait until bisque. Either way can work; it depends on your style and the effect you are trying to achieve.
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