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The following is a brief description of hot and cold patina processes and our patinas. For more in depth instruction covering all facets of patinas, please refer to our books, videos, and upcoming workshops.
Cold Patina Process
"Cold Patina" is a term used for applying patinas without heating the metal. The best room or air temperature for these patinas is between 65° and 75° F. Cold patinas, once applied to the metal, require hours or days to react. Often they involve cycles of applications involving layers of patina. The three basic techniques of applying the patina are to use a brush, sponge, or spray bottle. There are also some very interesting ancient techniques where the metal object is buried in substances soaked with the patina or wrapped in cloth soaked with a patina. A characteristic of most cold patinas is that they are opaque.
Hot Patina Process
"Hot Patina' is a term used when describing the application of a patina onto hot metal. The temperature of the metal during this technique should be between 150° to 250° F. An easy test for the correct temperature is to sprinkle a few drops of distilled water from a spray bottle onto the hot metal surface. If the water sizzles it is the correct temperature. If the water streams off the metal is too cold, if the water balls-up it is too hot. A characteristic of most hot patinas is that they are transparent.
There are three ways the metal may be heated: 1. (The most common) Use a propane torch with a 5-gallon propane bottle or use a torch with a gas/air mix used with an air compressor. 2. Use a hair dryer or a paint peeler. 3. Place the object in the sun. Apply the patina with a brush, spray bottle, or sponge.
Potassium Dichromate - stop out for patinas
This is an old formula for stopping the patina reaction. This may help when working with ferrous metals.
Potassium Dichromate is a very toxic chemical, be careful, and wear gloves, mask, and work in a well-ventilated area.
Add ¼ tsp to 16 Oz distilled water. This mixture should be a faint orange color.
Spray over the patina (or rust)
Let Dry
Apply clear sealer