Celia UK Posted March 16, 2014 Report Share Posted March 16, 2014 Have been using white earthenware to date, but decided to try some smooth, speckled stoneware (Valentines Special Fleck 1150 oC - 1280 oC). If I fire this to within the stated temperature range, could I use a lower firing transparent glaze or MUST I invest in a transparent that has a range that matches that of the clay? Link to comment Share on other sites More sharing options...
Chilly Posted March 16, 2014 Report Share Posted March 16, 2014 I know what the experts will say: test, test, test. I have some Mayco cone 06 transparent (105) that I've used on non-functional items, and it seems OK.............. Link to comment Share on other sites More sharing options...
bciskepottery Posted March 17, 2014 Report Share Posted March 17, 2014 The stoneware firing range (1150C to 1280C/2102F to 2336F) looks to be Cone 5 to Cone 10, well above the firing range for your low-fire clear. At those higher temperatures, I suspect you will over melt the glaze and potentially end up with a glaze pool at the bottom. Try it on a couple test tiles first, but make sure you put those test tile in a shallow bowl or on a cookie to catch any glaze runs. You might also want to do some tests on durability (freezing/boiling water/etc) if it fires okay, to make sure it will be okay for functional use. Link to comment Share on other sites More sharing options...
Celia UK Posted March 17, 2014 Author Report Share Posted March 17, 2014 I could have guessed the answer really!! I'll definitely test, thanks Bruce for the reminder to place pieces in a bowl or on cookie. One transparent I have has a firing range 1060o - 1100oC and I wondered how critical that 50o difference (lower end of clay range - upper end of glaze) would make. Link to comment Share on other sites More sharing options...
Chilly Posted March 17, 2014 Report Share Posted March 17, 2014 Celia, if it's a commercial glaze, look it up, Mayco and Duncan both post lists of "what happens to ^06 glaze when fired at ^6". I printed them out and keep them handy. Link to comment Share on other sites More sharing options...
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