You can use a toaster oven to heat patina metal for jewelry. It can
also be used in making colored pencil on copper pieces.
Brenda, try the following references for using colored pencil on
copper pieces. Try the Orchid Archives for using a toaster oven for a
heat patina on jewelry.
–Melissa Manley, Jewelry Lab [book], pp. 100-101
–Art Jewelry_ [magazine] Nov. 2008 p. 30ff.
–Art Jewelry_, July 2010, pp. 42-48
–Go to /ehow.com/
–Try the Orchid Archives