Mason Stains are combinations of oxides, fritted to insure uniformity of color and thus insure uniformity of results in firing. They can be used to color transparent or opaque glazes, slips, engobes or clay bodies. The stains may also be used effectively as colorants for direct brush decoration when mixed with water and a *flux. More flux is required at the lower temperatures to melt the stain.
Color results will vary according to glaze composition, firing temperature and kiln atmosphere. The quantity of stain used will vary between 1%-15% depending on the depth of color required. Most of the stains will produce the color indicated and remain stable up to 2300°F in both oxidation and reduction atmospheres. Some of the colors such as pink, yellow and purple can be volatile at higher temperatures, and in reduction atmospheres. Testing is recommended to determine stability.
Lead is not used in the manufacture of Mason Stains.