Potassium sulfate (K2SO4) (in British English potassium sulphate, also called sulphate of potash, arcanite, or archaically known as potash of sulfur) is a non-flammable white crystalline salt which is soluble in water.
Patina Recipe: DESPIAU BLACK (Hot process):
Solution 1:
– Copper Nitrate (1 tsp.)
– Clean, potable water (1 pint)
Solution 2:
– Ferric Nitrate (1/2 tsp.)
– Clean, potable water (1 pint)
Solution 3:
– Ammonium Sulfide (1/2 tsp.)
– Ferric Nitrate (1/2 tsp.)
– Clean, potable water (1/2 pint)
Solution 4:
– Potassium Sulfate (1/2 tsp.)
– Ferric Nitrate (1/2 tsp.)
– Clean, potable water (1/2 pint)
Note: Form a base patina with Solution 1, then add a light coat
of Solution 2, then apply Solution 3, then water, then Solution
4, then water, then Solution 3…until desired intensity is
achieved.
