Denise V Brown Posted June 29, 2015 Report Share Posted June 29, 2015 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? Link to comment Share on other sites More sharing options...
Joseph Fireborn Posted June 29, 2015 Report Share Posted June 29, 2015 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. Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted June 29, 2015 Report Share Posted June 29, 2015 I read recently that a good starting place is to drop it 100degC/212f from top temp and hold for 30 min. I would just try it out in your normal firing curve and see what happens. Link to comment Share on other sites More sharing options...
Denise V Brown Posted August 8, 2015 Author Report Share Posted August 8, 2015 Thank you guys for replying and the excellent info. I'll try both ways. Sorry I've been a long time answering you, I've been 4000km from my computer on the other side of the country in Tasmania. Link to comment Share on other sites More sharing options...
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