- Bright green powder
- Derived from iron chromate
- Very powerful colorant
- Even .5% can produce green color
- Material is very refractory
- Melting at 4109°F
- Isn’t particularly soluble in glaze melt
- In amounts over 2% glaze may be opaque
- Even small amounts in glaze melt don’t dissolve well
- may require ball-milling to disperse color evenly
- Adding less than 1% chromium oxide to recipe is usually sufficient for strong green
- Used in black glazes and stains for strong black
- If glaze contains tin oxide, it encourages some pink coloration
- If glaze contains zinc oxide, adding it will produce browns in high barium or sodium glazes
- less than 1 will produce intense chartreuse yellow/green colors
- Unaffected by oxidation and reduction, but volatile at higher temps (2265°F)
- May affect other glazes in kiln
- Fumes are extremely toxic
- Should be used with caution
- Available in 99-325-mesh grades
- also available as potassium dichromate and iron chromate
- All forms are hazardous.
