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Firing Down For Satin/matte Glaze Surface


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Hi, I am in the process of testing out a set of satin/matte porcelain glazes and I understand that a slow cooling for a glaze firing helps promote the formation of large crystals and thus matting of the glaze. I was wondering if there is any specific temperature at which I should hold the cooling for a period of time or if just a general slow cool will be enough? 

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Depends on the glaze, the amount of crystals you want formed, and if the surface is dinnerware mark resistant. If you are just looking for a satin matte glaze then just make a bunch of cylinders with a good surface space, apply glazes to it. Find some slow cooling schedules and test each one. It takes a while to figure out which one is best for you, because each kiln is different and the amount of wares you have in the kiln etc etc.

 

In general crystals form between 1900 and 1400. So you want to slow cool mostly during that time. Most of the slow cools I have seen do something like 100-125 an hour between 1900 and 1400. But I have read about some extreme cools like 50 an hour between 1900 and 1400, along with a few holds in there. I myself have fired some pretty slow cool downs. In general I think just a 125 slow cool between 1900 to 1400 is the place to start.

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