How to Apply: Liver of Sulfur Patina Application Cold or Hot Last Updated: 06/05/2009
Ingredients approx. 50 grams Sulphurated potash (Liver of sulphur) 1 liter water
The amount of potash can be varied in a very wide range to produce different densities of black. Grind the potash in a mortar, add it to the water, and stir with a nonreactive rod until the chemical is totally dissolved. This patina is much-used on bronze sculpture, but we currently use this patina only over a layer of blue-green. In good ventilation, and wearing a face-mask, heat the metal with a torch until the solution—brushed on with a soft brush—steams off instantly. Take care not to burn the surface of the blue-green while applying the second layer.