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Have I allowed enough time for carbon burnout?

Cracking/Exploding

Have I allowed enough time for carbon burnout?
It is important to burn out all carbon from the ware before higher temperatures are reached (1200°F or 650°C). It takes time for oxygen to move into the pourous body, react with the carbon and then leave. If carbon remains, many problems can occur. These include problems with colour, glaze fit, strength, blistering and discolouration. Use of a downdraft vent system, combined with slower heating, virtually eliminates carbon related problems.

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