A very consistent formula with consistent results after firing.
Put the dried clay on shelf paper on a kiln shelf, as the copper can stick to the shelf slightly. Place in a hot kiln and fire at 1778* (970C) for 30 minutes.
Place piece no larger than a 50cent coin and or 35 grams in weight on a firing brick and heat until cherry red for at least 5-10 minutes, depending on size and firing power of the torch.
After firing, take the fired piece out of the kiln with tweezers or tongs, and quench immediately in cool water.
This will remove most of the oxidized layer which occurs during firing. If the piece has a lot of fire scale it will require pickling.
Please click on the following links for additional information:
Instructions from the manufacture.
Demonstration of a basic project made out of Art Clay Copper.