Gold is renowned for its warm colour and preciousness as a metal that's traditionally used for wedding rings. Although gold prices have skyrocketed in recent years, gold is still a cost-effective metal compared to platinum. Metal used in jewellery-making, including gold, must be annealed -- heated with a torch -- so that it is soft enough to work with. This step is repeated consistently during the jewellery-making process since gold gets work-hardened when it's shaped, hammered and sawn. Gold has a specific annealing temperature, which is identified by the colour it turns when it is heated.
Place the gold sheet on the fire brick.
Light the torch using the flint striker. Open the valve so that the flame is hot. The flame should burn blue, not yellow.
Hold the torch about one to two inches above the metal, slowly passing the flame across the length of the metal.
Move the flame back and forth over the gold until the colour starts to change. 14-karat gold turned dark red when it has reached annealing temperature.
When the gold turns dark red, turn off the torch. Pick up the gold with the fire tweezers and quench the metal by dropping it into the Pyrex bowl filled with water.
- "The Complete Book of Jewelry Making"; Metallurgy; Carlos Codina; 2006
- "The Art and Craft of Making Jewelry"; Metals and Their Properties; Joanna Gollberg; 2006
- Anneal metal in a room devoid of natural light so you can see the subtle change in the metal's colour when it's heated.
- Comstock/Comstock/Getty Images