One of the most exciting aspects of enamelling is watching powdered glass transform into a smooth, colourful surface on metal. But how you fire that enamel makes a huge difference to your results. The two main techniques - torch firing and kiln firing - both have their strengths, and many jewellers choose to use both depending on the project.
Vitreous enamel fuses to metal at around 760–815°C (1400–1500°F). Heat must be applied evenly and at the right intensity to avoid under-firing (resulting in a rough, orange-peel surface) or over-firing (causing discolouration or loss of detail). Whether you use a torch or kiln, the goal is the same: melt the enamel just enough to create a smooth, glossy surface without damaging the underlying metal.
Torch Firing
Torch firing is a highly accessible method, particularly popular with beginners, hobbyists, and those working on smaller pieces.
How It Works
The piece is placed on a trivet or mesh supported over a tripod. A torch flame is applied from underneath, heating the metal until the enamel reaches fusion point.
Advantages
- Low Cost: Requires only a torch, trivet, and mesh — much cheaper than a kiln.
- Portability: Easy to set up in small workshops or classrooms.
- Creative Control: The jeweller can directly observe and stop the process the moment the enamel fuses.
- Special Effects: Torch firing can produce subtle gradients, flame patterns, and oxidation effects that kilns cannot.
Challenges
- Heat is less uniform, leading to uneven surfaces if not carefully controlled.
- Torch size limits the scale of work; large pieces are difficult to heat evenly.
- It requires close attention and practice to avoid burning or under-firing.
Kiln Firing
Kiln firing is the professional standard for enamelling. It provides precise, repeatable results and is essential for larger or more complex projects.
How It Works
The kiln is preheated to the correct temperature. The enamelled piece is placed on a firing rack or trivet and inserted into the kiln, where it fuses evenly under controlled conditions.
Advantages
- Consistency: The entire piece is heated evenly, producing reliable results.
- Batch Production: Multiple pieces can be fired simultaneously, saving time.
- Complex Techniques: Kiln firing is necessary for techniques such as cloisonné, plique-à-jour, or multi-layer builds.
- Scale: Handles larger and thicker metal pieces with ease.
Challenges
- Cost: Kilns are a larger investment compared to torches.
- Setup Time: Kilns require preheating before use.
- Less Visual Control: You cannot fully observe the piece fusing in real time; instead, you rely on timing.
Both torch and kiln firing are valuable techniques in enamelling. Torches provide accessibility and creative freedom, while kilns deliver consistency and professional precision. At Maddisons of Durham, we supply a complete range of enamelling equipment to suit every maker. Whichever method you choose, mastering your firing process will unlock the full potential of vitreous enamels.
