Mason 6315 Zirconium Vanadium Stain Ribs & Scrapers This body employs New Zealand

This body employs New Zealand Halloysite

A common colorant which produces a variety of browns

That means that it's presence enables reducing feldspar content which in turn provides even more opportunity to source Al2O3 from kaolin or clay

smooth modeling clay

Mason 6315 Zirconium Vanadium Stain Ribs & Scrapers This body employs New ZealandStains are a mixture of ceramic oxides and coloring metal oxides that are melted in kilns, quenched, ground to specific mesh size (some are acid washed), and colored with organic dyes to simulate the fired color. Essentially they are fritted colorants. They are made and manufactured for several reasons: to provide a consistent and stable form of colorant that doesnt dissolve in the glaze melt as easily as coloring metal oxides; to make colorants safer