My second attempt...
Posted 14 January 2013 - 11:27 PM
I used the ternary chart Hermes provided but I'm thinking that it was for cone 10 glazes. My flux/alumina/silica numbers came up in the best melt zone. Also, I'm leach testing them overnight. Both mugs are on the same body, and the glazes use the same coloring oxides. The base glazes are quite a bit different though.
Posted 15 January 2013 - 06:32 AM
That could help the melt.
I like what looks like the breaking effect on the one on the right. By that I mean it looks like it could change colors over ridges if the melt were a little stronger. Good job!
If they are the same colorants what are they and what is the difference in your base glazes. No need to share the recipe, just curious what you are playing with.
Posted 15 January 2013 - 10:00 AM
Thanks for the kind words
Posted 15 January 2013 - 10:59 AM
"But it does move," said Galileo under his breath.
Posted 16 January 2013 - 12:45 AM
I did a leach test overnight and both glazes passed. I was concerned the one on the right wouldn't. And, I have yet to make a glass proper. Hermes' ternary graph points to why I think, but I need to make some limits for cone 6 gloss glazes (and figure out how to do so).
Posted 16 January 2013 - 07:11 AM
Remember that the home kind of leaching tests are only a "rule in" kind of test, not a "rule out". They are not accurate enough to give you data that says "it passes". If you can visually see changes after the home kind of test, then you KNOW it will show leaching of various components on a real standardized lab test. If it "passes" the "home test", that only tells you that is it not totally terrible. It does not mean that ot would not show leaching of some components on a real laborotory testing regime.
Immediate Past President; Potters Council
Professor of Ceramics; New Hampshire Insitute of Art
Posted 16 January 2013 - 09:57 AM