Things You'll Need
Oven or kiln
The term "stainless steel" refers to several types of steel that contain small amounts of chromium, which helps the steel resist rusting and corrosion. This property is appealing and useful for both practical and artistic purposes. However, stainless steel is limited in its color. While it is possible to paint or tint stainless steel, the only ways to permanently alter the color are through chemical changes or heat. Heat is one of the simpler methods of coloring stainless steel, but it is somewhat dangerous and the results can vary greatly.
Arrange the steel item on a pan or similar flat item that will withstand high heat.
Put the oven thermometer into your oven and turn it on to about 500 degrees Fahrenheit. When the oven has reached the right temperature, put the pan into the oven. If you are using a kiln, put the pan in before turning on the kiln. A kiln will most likely have a built-in thermometer, so you may not need to put one into the kiln.
Wait. Times will vary depending upon the composition and thickness of the steel. Monitor your steel closely. Turn up the temperature, if necessary, to achieve a true blue color. Stainless steel turns blue at somewhere between 500 and 600 degrees Fahrenheit, so a temperature that is too low may not achieve the color or shade that you want.
Turn off the oven or kiln when you are satisfied with the color and wait for the steel to cool completely before handling. Put the steel into a bucket of water to cool it faster, if desired.
If your oven does not reach a high enough temperature, use an oxy-acetylene torch. These torches achieve very high temperatures but are dangerous and make an inconsistent effect on the color of metal, which may or may not be desirable.
Keep a fire extinguisher nearby and work in a well-ventilated area.
- Maille Artisans International League: Heat Coloring (Oxidizing) Steel
- British Stainless Steel Association: Heat Tint (Temper) Colours on Stainless Steel Surfaces Heated in Air
- Maille Artisans International League: Effects of Firescale on Various Metals
- Maille Artisans International League: Heat Coloring Stainless Steel for Beginners