Mason 6464 Zirconium Yellow Stain Size:1/4 lb. A medium-fine ground fireclay

A medium-fine ground fireclay

it disassociates enough in many glaze types to be useful as a source of Al2O3 to the melt (however the finer the particle size the better)

Synonyms: Chromium Oxide

A natural calcium silicate used to reduce shrinkage in clay bodies and glazes during firing

Available in 4 through 9 inch lengths x 7/8” wide

Mason 6464 Zirconium Yellow Stain Size:1/4 lb. A medium-fine ground fireclayStains 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