Iron actually turns greenish when fired to vitrification. Iron rich clay would be more of a dark brown, you are thinking of tera cotta, which is fired a low temperature, and if used as currency wouldn't really make any sense as it would be incredibly easy to counterfeit.
Sorry to be a party pooper, I have a degree in ceramics.
Nice looking work though!
Sorry to be a party pooper, I have a degree in ceramics.
Nice looking work though!
The high proportion of bone ash present along with the iron changes the chemistry and results in the characteristic red glaze.
