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How do I fire lead free glazes?

Leadfree glaze problems

Lead softens a glaze and allows it to be fired over several cone numbers. Glazes made without lead have a narrower firing range. Typically, lead glazes are able to be fired over a four cone number range (example 08 to 05). Lead free glazes typically need to be fired within two cone numbers (example 06 to 05) - less than half of that for lead glazes.

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