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Unglazed ceramics - how to fire?

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  • Unglazed ceramics - how to fire?

    Hi All! I'm a beginner out there and have been working on a stoneware vessels using PSH stoneware 519S clay body firing at cone 6. I wanted to keep the vessels unglazed as they won't be holding water etc and I work really hard on creating a silky texture. They all survived the bisque firing no cracks etc but on the second glaze (high temperature) they have all cracked - incredibly disappointing! If the intention is to keep them unglazed what is the best method of firing to vitrify the clay as I can't leave it in it's bisque format? Firing once at a high temperature (no bisque firing), firing twice at a lower temperature? Really need some help on this one so it doesn't happen again?
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