Natas Setiabudhi Posted July 2, 2012 Report Share Posted July 2, 2012 Hi everybody I had glaze failures in my works. I used commercial base glaze for my recipes. When I added coloring oxide such mangan, zircon and stain of blue and brown, the glaze had succeed. But added red stain the glaze became blebbing (small air bubbles) and willl be blistering if broken out. Any idea why this happens? Any comment I really appreciate it. Link to comment Share on other sites More sharing options...
icyone Posted July 5, 2012 Report Share Posted July 5, 2012 what kind of glaze and what type clay? Link to comment Share on other sites More sharing options...
perkolator Posted July 5, 2012 Report Share Posted July 5, 2012 I've found some combo's of glaze and colorants just do this. I was thinking it was an off-gassing issue, but perhaps someone who knows more about this will chime in. One thing to try and test is to do a longer soak at temp and see if it helps settle things before cooling. Link to comment Share on other sites More sharing options...
Natas Setiabudhi Posted July 8, 2012 Author Report Share Posted July 8, 2012 Hi Thanks for replying. I bought the base glaze from the supplier, so I didn't know what the recipe is? meanwhile I made my own body such as local clay, china clay, and feldspar. The glaze temperature is high fired, above 1200C. Something that I wondered, I used same base glazes for all the oxide and stain colors but only red stain that had failure the rest were good. The surface become blebbing. I had tried to soak the temperature but the result still not good. May be any alternative solving? Thank you Link to comment Share on other sites More sharing options...
neilestrick Posted July 10, 2012 Report Share Posted July 10, 2012 Most red stains, other than inclusion pigments that are rated for cone 9, will burn out their color. I'm betting you're getting some off-gassing of the stain that is causing the bubbling. If you're using an inclusion pigment, then it's just a compatibility issue. Not all stains work with all glazes. Link to comment Share on other sites More sharing options...
Natas Setiabudhi Posted July 11, 2012 Author Report Share Posted July 11, 2012 Thanks for all the comments, I really appreciate it. Link to comment Share on other sites More sharing options...
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