Kammymckenna Posted August 10, 2019 Report Share Posted August 10, 2019 I was given boxes of commercial manufactured ready to paint bisque pieces. I teach middle school art and want to use this bisque in class, but how do I determine what cone I need to fire to? What will happen if its ^05 and I fire it to ^6? Link to comment Share on other sites More sharing options...
Denice Posted August 10, 2019 Report Share Posted August 10, 2019 I have seen a kiln full of C05 fired to C5, the pots were melted into a puddle and ruined the shelves. You could put a small bisque piece in a tray to test fire a C6 glaze, it is probably C05 clay. Link to comment Share on other sites More sharing options...
oldlady Posted August 10, 2019 Report Share Posted August 10, 2019 if you have a Paint your own Pottery store nearby, you can ask if they will look at some of the pieces to see if they recognize them. there are not that many manufacturers of molds and the normal kind found all over the US is fired at 06 for both bisque and glaze. as a precaution, never fire to cone 6 unless you know the source of the work to be fired. Link to comment Share on other sites More sharing options...
Benzine Posted August 10, 2019 Report Share Posted August 10, 2019 What kind of project, are you using them for, might I ask? What are the lesson goals? Link to comment Share on other sites More sharing options...
neilestrick Posted August 10, 2019 Report Share Posted August 10, 2019 For potters, bisque is always done at low fire temps, from cone 08-03. If you go hotter, the clay will begin to vitrify and won't be porous enough to accept glaze easily. Most commercial slip cast bisque is made of low fire clay. You'll be bisque firing and glaze firing to cone 05/04. If you fire it up to cone 5/6, it will melt and ruin your kiln shelves and possible the kiln, too. Link to comment Share on other sites More sharing options...
Benzine Posted August 10, 2019 Report Share Posted August 10, 2019 1 hour ago, neilestrick said: For potters, bisque is always done at low fire temps, from cone 08-03. If you go hotter, the clay will begin to vitrify and won't be porous enough to accept glaze easily. Most commercial slip cast bisque is made of low fire clay. You'll be bisque firing and glaze firing to cone 05/04. If you fire it up to cone 5/6, it will melt and ruin your kiln shelves and possible the kiln, too. Or if you're like me, someone does that, and you get a cheap kiln out of the deal... Link to comment Share on other sites More sharing options...
Chilly Posted August 14, 2019 Report Share Posted August 14, 2019 Highly likely it's low fire. Paint your own is rarely for functional ware, therefore it's not worth spending extra on high fire slip. As above, test a piece by firing it on a lipped tray or saucer made from high fire clay. Link to comment Share on other sites More sharing options...
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