The Kiln & Firing Process

At The Potter of Leith, all work is fired in our propane-fired kiln, which has a capacity of approximately 11 cubic feet. This allows us to fire a carefully managed volume of work while maintaining consistency, quality and control throughout each firing cycle.

The Firing Process

Pottery is typically fired in two stages:

1. Bisque Firing

The first firing, known as bisque firing, prepares the clay for glazing by removing moisture and hardening the work into a stable ceramic state.

  • Fired to Orton Cone 07 (980°C)
  • Prepares work for glazing
  • Strengthens fragile greenware for handling

2. Glaze Firing

After glazing, work is fired again at a higher temperature to melt and mature the glaze, creating the final surface finish.

  • Fired to approximately 1285°C (Orton Cone 9/10)
  • Fired in a reduction atmosphere
  • Produces rich, varied and often unpredictable glaze effects

Reduction Firing

Our kiln is fired in a reduction atmosphere, meaning oxygen levels are carefully controlled during firing. This has a direct impact on how glazes and clay bodies develop, often enhancing depth, variation and surface complexity in finished work.

Clay Compatibility

Different clay bodies require specific firing temperatures and conditions.

Because of our firing range and reduction atmosphere, our standard firings are not suitable for terracotta or earthenware pieces.

It is essential that all work is made from compatible stoneware or porcelain clay bodies to ensure both safety and successful results.

Kiln Loads & Individual Firings

Whilst we always try to accommodate requests where possible, it is not usually practical to fire individual pieces or small quantities on demand.

Kiln firings are planned as full or well-balanced loads to ensure:

  • Even heat distribution
  • Consistent results
  • Efficient energy use
  • Reduced risk of kiln damage

Alternative firing schedules or temperatures may only be considered where a kiln can be filled appropriately.

Safety, Risk & Responsibility

Firing ceramics carries inherent risks due to the extreme temperatures involved.

Over- or under-firing can damage both the work and the kiln itself, so careful control is essential at all stages of the process.

When firing work for external makers, a security deposit is required. This helps cover potential damage to kiln shelves or other makers’ work, which can be costly to replace.

Enquiries

If you have questions about kiln space, firing suitability, or wish to discuss having work fired at the studio, please contact Andy directly.

📞 07505 113 836

We recommend calling where possible for the quickest response.