GreyBird Posted September 14, 2018 Report Share Posted September 14, 2018 Hi, I have a small test kiln ready to fire a bunch of test tiles with new glazes. The test tiles are greenware. I'd like to glaze them and and fire right to cone 6 since they are just test tiles and not likely to explode. My question is do glazes come out the same if applied to greenware vs bisque ware? -M Link to comment Share on other sites More sharing options...
JohnnyK Posted September 14, 2018 Report Share Posted September 14, 2018 Try it and find out. A few of the members here skip the bisque step and go straight to glaze. As far as exploding is concerned, if the test tiles are bone dry before the glaze process, you shouldn't have a problem, otherwise you may be looking at a bunch of glazed shards. If they are not bone dry, you might run an appropriate preheat segment in your firing program... JohnnyK Link to comment Share on other sites More sharing options...
neilestrick Posted September 14, 2018 Report Share Posted September 14, 2018 If you're going to be bisque firing your pots, then I would do the test tiles the same way. Some glazes will come out the same, others do not like going on greenware. Link to comment Share on other sites More sharing options...
liambesaw Posted September 14, 2018 Report Share Posted September 14, 2018 I've heard the addition of 2% bentonite helps with single firing glazes. Link to comment Share on other sites More sharing options...
GreyBird Posted September 14, 2018 Author Report Share Posted September 14, 2018 Yes, I'm mixing new glazes and looking to duplicate what I will get out of the big kiln so what Neil says makes the most sense in my case. I will bisque them. Thank You! Link to comment Share on other sites More sharing options...
preeta Posted September 17, 2018 Report Share Posted September 17, 2018 A couple of members here once fires. I think Oldlady is one of them. I tried the same G in our school test kiln. I was blown away by how different they turned out. I also noticed a difference in glaze outcome when test tiles were fired in test kiln vs regular kiln. I no longer use the test kiln for testing glazes. Link to comment Share on other sites More sharing options...
Pawelpksa Posted September 21, 2018 Report Share Posted September 21, 2018 see Simon Leach youtube, he recenlty tries ones firing Link to comment Share on other sites More sharing options...
Rae Reich Posted September 30, 2018 Report Share Posted September 30, 2018 A lot will depend on the pots you choose to once-fire. Thin-walled or heavily carved pieces will absorb the water in the glaze unevenly. @oldlady is careful to take this into account when she is making her pots. Less water in the glaze, bentonite and faster dipping can work. Lots of experimentation will make you familiar with what your pots can take. Link to comment Share on other sites More sharing options...
curt Posted October 1, 2018 Report Share Posted October 1, 2018 Similar to what Rae is talking about, when you dip a raw (greenware) test tile into glaze it will absorb less glaze than a bisqued test tile would. This is very difficult to control, and you would have to weigh the test tiles before and after dipping when well dried to know for sure if you were getting the same amount of glaze applied. Way too hard! Just bisque them first. Link to comment Share on other sites More sharing options...
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