Glaze contamination during the firing process can ruin otherwise perfect ceramic pieces, leading to uneven finishes, discoloration, or unwanted textures. To avoid these issues, follow these proven methods to keep your glazes pristine.

1. Kiln Maintenance and Cleaning

Regularly clean your kiln shelves and interior to remove residual glaze drips or dust. Use kiln wash or shelf paper to create a barrier between the glaze and shelves, preventing cross-contamination.

2. Proper Glaze Application

Apply glazes evenly and avoid overloading brushes or dipping tools. Wipe excess glaze from the bottom of pieces before firing to prevent running and contamination of kiln shelves.

3. Separate Glazed and Unglazed Ware

Fire glazed and unglazed pieces separately whenever possible. If mixed firing is necessary, place unglazed items on higher shelves to avoid glaze drips.

4. Controlled Firing Cycles

Use slow ramp rates during the initial heating phase to allow glazes to mature evenly without bubbling or running. Monitor kiln temperature closely to prevent overheating.

5. Use Protective Stilts or Supports

For delicate or intricate pieces, use ceramic stilts or supports to elevate work and minimize contact with kiln shelves, reducing the risk of glaze sticking.

By implementing these strategies, potters and ceramic artists can significantly reduce glaze contamination, ensuring high-quality, consistent results in every firing. Regular practice and attention to detail will further refine your process over time.