For our November 2008 issue, Ron Pascho contributed a great article on an innovative way to etch metal by using saltwater. Part of the etching process involves using Press-n-Peel (or PnP) paper as a resist.

The paper, originally invented for etching circuit boards for high-tech industries, has become popular with jewelry makers because you can use it to lay down a resist on metal quickly and accurately. A pattern can be transferred from the PnP paper to the metal using a common household iron; however, irons vary in temperature, so it can be hard to tell what setting on your iron corresponds to the ideal temperature for transfer.

Pascho contributed the following tip:"Ron Pascho uses a magnetic thermometer intended for wood stoves to determine the temperature of his iron. Adhere the magnet to the surface of your iron, and adjust the iron's settings until it reaches the correct temperature. Before ironing the PnP paper onto your metal sheet, use heat-resistant oven mitts to remove the thermometer."

The ideal temperature range for transferring the resist image is 275-325 degrees Fahrenheit (that's 135-163 degrees Celsius). If you can't find a wood-stove thermometer in your local hardware store, check out Hardware & Tools online; they have a couple of options for under $15.