centered Posted December 13, 2010 Report Share Posted December 13, 2010 Hi I was wondering why my raku glaze looks like huge craters and easily flakes off. when i raku fire should i bring the temperature up slowly and hold it there for some time? do you think this may help? Or... did i apply the glaze too thick? i found that my kiln will get up to 1850 degrees within 10-15 minutes. this was my first firing and will do many more test firings soon. thanks Link to comment Share on other sites More sharing options...
Marcia Selsor Posted December 13, 2010 Report Share Posted December 13, 2010 When firing by vision information rather than pyrometer, the glaze does through stages easily observed visually. I always equated the crater state as the "pancake ready to flip" then shortly after that , the glaze fluxes and turns to glistening shimmering wet look, which means pull it out of the kiln. Put a small ^06 in there to see how close the pyrometer is reading. Your crater stage is under fired. Maybe your pyrometer is off. Also go a little slower. 10-15 minute for the first firing may be a little fast. Fire visually if you are using shiny glazes. Get to the shimmering wet stage visually. Marcia Link to comment Share on other sites More sharing options...
Seasoned Warrior Posted December 13, 2010 Report Share Posted December 13, 2010 When firing by vision information rather than pyrometer, the glaze does through stages easily observed visually. I always equated the crater state as the "pancake ready to flip" then shortly after that , the glaze fluxes and turns to glistening shimmering wet look, which means pull it out of the kiln. Put a small ^06 in there to see how close the pyrometer is reading. Your crater stage is under fired. Maybe your pyrometer is off. Also go a little slower. 10-15 minute for the first firing may be a little fast. Fire visually if you are using shiny glazes. Get to the shimmering wet stage visually. Marcia Just like Marcia said. I prefer to use visual conditions to know if I'm up to temperature. That shimmering, once seen is hard to forget and tells you the glaze is "a point" . It's been my eperience that the visual clues are actually more accurate than using instrumentation and a whole lot faster. Good luck, Regards, Charles Link to comment Share on other sites More sharing options...
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