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Home : Decals : How to Apply & Fire Decals :

Under Firing & Over Firing

Ensure your kiln is operating properly by periodically placing test cones throughout your kiln during firing.

  • Test cone monitoring recommended – Periodically place test cones throughout your kiln to confirm proper operation.

  • Caution: Do not unload your kiln while it is still very hot — the cooler room temperature may cause crazing or crack the ware.

  • Additional resources: For more on firing information, visit www.ortonceramic.com and navigate to Firing Products > Products for Ceramic Arts > Pyrometric Cones > Reference Library for their helpful reference materials.

  • Under Firing Problems (Correctable) -These issues can be easily corrected by re-firing to the correct temperature: Colors look dull and/or are powdery, Pink shades appear orange or brown, or Halo from overcoat is still visible.

  •  Over Firing Problems (Not Correctable) - Unfortunately, these overfiring issues cannot be corrected: Colors look faded, Red shades appear grey or white, or Decal sank into glaze, leaving an outline.

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Under Firing & Over Firing Problems & Solutions

1. Colors look dull and/or are powdery. 2. Pink shades are orange or brown. 3. Halo from overcoat is still visible.

All these problems may be easily corrected by re-firing to the correct temperature.

1. Colors look faded. 2. Red shades appear grey or white. 3. Decal sank into glaze leaving an outline.

Unfortunately these overfiring problems cannot be corrected.

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