Ferro Stains are cadmium-based, zirconium-encapsulated ceramic stains originally produced by Degussa, a forerunner of encapsulated stain technology focused on making bright true reds, yellows, and oranges that would hold at high temperatures.
These stains are encapsulated - meaning that the main coloring oxide in the stain is encapsulated in zirconium. Cadmium is really toxic and isn't stable at higher temperatures, so the colors would start to fade above cone 03. The zirconium bonds with the coloring oxide and protects the color from fading at higher temperatures. It also makes the stain more stable in different types of base glazes, and helps keep toxic oxides from leaching out of a glaze. By surrounding and bonding the cadmium with zirconium, the colors produced with cadmium have a wider firing range and are more stable in the glaze.
Stains can be used to color slips, underglazes, and glazes. They need something to help them bind when fired, like a melter or flux. For example, to make an underglaze, you can use a mixture composed of 1/3 stain, 1/3 kaolin and 1/3 frit. If stains are just mixed with water and fired, they can still be powdery afterwards.
- The price listed is the maximum per pound cost.
- Smaller quantities are available by the ounce.
- Quantity discounts apply; click on a stain to see discount table.
The color samples shown may vary from actual colors. Every effort was made to make them as accurate as possible. However, due to many factors including individual monitor settings, these examples should only be used as a reference point.