TJR Posted April 29, 2013 Report Share Posted April 29, 2013 I have been testing this glaze, and I like the surface-kind of a bright Celadon without the colourants. I want to prevent it from running as it does now. I know that I need to up the clay content, but by what percentage? How much kaolin can I add without changing the character/shininess of the glaze? Here's the recipe Cone 10 reduction Synthetic Ash. Potash feldspar 33 Whiting 33 Albany slip 13 Kaolin[EPK[ 5 Bentonite 5 Bone Ash 3.5 Dolomite 2.5 Silica[flint] 1.5 ------ 96.5 Red Iron ox. 3 Cobalt carb. 1.5 Total 100 Link to comment Share on other sites More sharing options...
Mark C. Posted April 29, 2013 Report Share Posted April 29, 2013 I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on. If its to much cut that to 1/2 of double. There will be a point that it gets dry as EPK has so much silica and alumina. Good luck testing Mixing a few tests today for this weeks glaze fire as well. Link to comment Share on other sites More sharing options...
TJR Posted April 29, 2013 Author Report Share Posted April 29, 2013 I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on. If its to much cut that to 1/2 of double. There will be a point that it gets dry as EPK has so much silica and alumina. Good luck testing Mixing a few tests today for this weeks glaze fire as well. Mark; I am thinking like 5%, then another 5%, then another 5% in the same cup. Thanks for your rapid response. Sounds like you are back at it ,and the holiday is over. Tom. Link to comment Share on other sites More sharing options...
Mark C. Posted April 29, 2013 Report Share Posted April 29, 2013 I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on. If its to much cut that to 1/2 of double. There will be a point that it gets dry as EPK has so much silica and alumina. Good luck testing Mixing a few tests today for this weeks glaze fire as well. Mark; I am thinking like 5%, then another 5%, then another 5% in the same cup. Thanks for your rapid response. Sounds like you are back at it ,and the holiday is over. Tom. Holiday is over thats for sure-fire two kilns this weekend Mixed glazes today-will glaze a load on Monday Just did Arizona show and next show is in two weeks at UC Davis in middle of California near Sacramento galleries need pots now and the list goes on- Holiday seems like a distant memory At least we have some Great spring weather. I like the 5 then 5% deal as you will see right away whats going on. Mark Mark Link to comment Share on other sites More sharing options...
Marcia Selsor Posted April 29, 2013 Report Share Posted April 29, 2013 I have stopped running of glazes with as little as 3 % but maybe I didn't have as much initial running. Marcia Link to comment Share on other sites More sharing options...
neilestrick Posted April 29, 2013 Report Share Posted April 29, 2013 Just adding EPK can stiffen it up, but can also alter the surface because it changes the silica/alumina ratio. To keep the ration consistent while stiffening it up, add equal parts EPK and flint (silica). Start with 2% each, and go up in 2% increments. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.