Rebekah Krieger Posted February 28, 2019 Report Share Posted February 28, 2019 So to convert a glaze from high fire (cone 9) to a mid range do you increase the flux? What would you replace it with? Or ?? I’m trying to wrap my head around the chemistry of converting. I’m currently in love with a recipe from Tom Tuner but it’s cone 9. Thank you! Link to comment Share on other sites More sharing options...
liambesaw Posted February 28, 2019 Report Share Posted February 28, 2019 You'll have to test, but boron is the magical flux for converting to mid-range. I think 5% max boron Link to comment Share on other sites More sharing options...
Rebekah Krieger Posted February 28, 2019 Author Report Share Posted February 28, 2019 Dang it! I don’t have any thanks though! Link to comment Share on other sites More sharing options...
liambesaw Posted February 28, 2019 Report Share Posted February 28, 2019 2 minutes ago, Rebekah Krieger said: Dang it! I don’t have any thanks though! Well it comes in many forms, frits 3134 and 3124, gerstley borate, to name a few. Link to comment Share on other sites More sharing options...
Rebekah Krieger Posted February 28, 2019 Author Report Share Posted February 28, 2019 oh dear! Now I feel silly. I have all of those. I apologize for the confusion. I’m fairly new to glaze mixing. I have altered a few recipes but now I am in the process of learning how to construct my own. Thank you So what do you substitute 5% of the silica with that? Link to comment Share on other sites More sharing options...
Rebekah Krieger Posted February 28, 2019 Author Report Share Posted February 28, 2019 I think it’s due time that I re-watched John Britt‘s video. Link to comment Share on other sites More sharing options...
liambesaw Posted February 28, 2019 Report Share Posted February 28, 2019 Read this too: short answer is it can take work depending on the glaze https://digitalfire.com/4sight/education/reducing_the_firing_temperature_of_a_glaze_from_cone_10_to_6_101.html Link to comment Share on other sites More sharing options...
Bill Kielb Posted February 28, 2019 Report Share Posted February 28, 2019 Maybe some simplicity actually. Most things are cone 10 ish because of the geology of the earth and that is where things melt. Several ways to get low: less silica and alumina; however you are constrained by your feldspars and clays. More flux including high levels of lithium or a Bristol glaze using the appropriate portions of zinc in a 0.7 Ro base, and finally, Boron! So it turns out approximately 0.15 Boron (+/- 10%] (UMF) is ideal for cone six. Boron can be obtained from Gerstley, Gillespie, and Frits to name a few. The easy way is to find a suitable Boron source that can be added to your recipe while adjusting the flux and surface texture to match the original. It’s actually much easier than it sounds but as in all things likely progressively fired to obtain a texture and color match as close as practical to the original. that would be the hard part. Link to comment Share on other sites More sharing options...
dhPotter Posted February 28, 2019 Report Share Posted February 28, 2019 If you can get your hands on John Britt's ^6 glaze book, look at page 17-18. He talks about how to move from ^10 to ^6. Link to comment Share on other sites More sharing options...
neilestrick Posted February 28, 2019 Report Share Posted February 28, 2019 Sometimes as little as 3% 3134 or Gerstley will do the trick. Link to comment Share on other sites More sharing options...
Rebekah Krieger Posted March 1, 2019 Author Report Share Posted March 1, 2019 6 hours ago, dhPotter said: If you can get your hands on John Britt's ^6 glaze book, look at page 17-18. He talks about how to move from ^10 to ^6. Yes! I do have that book. Some of my favorite recipes in there Link to comment Share on other sites More sharing options...
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