bciskepottery Posted August 28, 2015 Report Share Posted August 28, 2015 I'm taking opportunity of this post to ask a question. Making the piece => one fire Underglazing => second fire Transparent glazing : third fire Oups, my electricity budget is suffering. So could it we possible to save one firing by underglazing before biiscuit? Which means: making the piece, underglazing then first fire. Your thought :-) I apply underglaze to both greenware and bisque. When putting on bisque, the key is to allow it time to dry before glazing. Two firings. I did the three-fire approach for one set of items -- very involved artwork done by my painting teacher on bisque that I was fearful of smudging. However, after one three-fire round, I became comfortable with just glazing over her work and doing only a second firing. Link to comment Share on other sites More sharing options...
PRankin Posted August 28, 2015 Report Share Posted August 28, 2015 I'm taking opportunity of this post to ask a question. Making the piece => one fire Underglazing => second fire Transparent glazing : third fire Oups, my electricity budget is suffering. So could it we possible to save one firing by underglazing before biiscuit? Which means: making the piece, underglazing then first fire. Your thought :-) You may apply the underglaze on greenware and then bisque fire. You can then apply more underglaze to touch it up if needed before glazing and the second firing. Or you can apply the underglaze to the bisque ware and glaze it, but in either case let the underglaze dry completely before glazing. Paul Link to comment Share on other sites More sharing options...
neilestrick Posted August 28, 2015 Report Share Posted August 28, 2015 Underglazes have a lot of colorant in them. They are very saturated colors, so even if they are fired high enough to gloss over they could still leach. Glossiness does not indicate food safety. Link to comment Share on other sites More sharing options...
Stardust Pottery Posted May 23, 2018 Report Share Posted May 23, 2018 Hi all, just a few years late in seeing/replying .. recently I've been reading a lot about liquid quartz sealer, which is distributed via Australia (especially convenient for Lilly from etched)! It's essentially used to seal any pottery to make it safe to eat off of and make it impermeabile to liquids .. SUPER COOL stuff Link to comment Share on other sites More sharing options...
Min Posted May 23, 2018 Report Share Posted May 23, 2018 2 hours ago, Stardust Pottery said: Hi all, just a few years late in seeing/replying .. recently I've been reading a lot about liquid quartz sealer, which is distributed via Australia (especially convenient for Lilly from etched)! It's essentially used to seal any pottery to make it safe to eat off of and make it impermeabile to liquids .. SUPER COOL stuff It does look good for work that doesn't contain anything that could be harmful, but not for over underglazes. From their FAQ page "No, Liquid Quartz cannot make your underfired or toxic glazes food safe." https://madeofaustralia.com/data/documents/Liquid-Quartz-General-Information-Sheet-V042016.pdf https://madeofaustralia.com/faq/ Welcome to the forum and thanks for letting us know about it Link to comment Share on other sites More sharing options...
yappystudent Posted May 24, 2018 Report Share Posted May 24, 2018 My 2 cents: I've noticed duncan underglazes make their own shiny finish at mid-fire temps. At cone 5-6 all my duncan colors will come out with at least a satin finish, some almost glossy, with no clear glaze at all. However at those temps they start to flow and in some cases the clay will start to show through where raised. Good or bad depending. This effect looks beautiful over dark clays, and the individual colors begin to have some real character and behave like regular pottery glazes. ( Try a single layer of duncan "bright purple" over buff clay at ^5, you won't regret it). Link to comment Share on other sites More sharing options...
yappystudent Posted May 24, 2018 Report Share Posted May 24, 2018 On 8/28/2015 at 2:37 AM, seancisse said: I'm taking opportunity of this post to ask a question. Making the piece => one fire Underglazing => second fire Transparent glazing : third fire Oups, my electricity budget is suffering. So could it we possible to save one firing by underglazing before biiscuit? Which means: making the piece, underglazing then first fire. Your thought :-) I used mayco stroke n' coat underglazes on raw clay tiles with good results, nice bright colors, velvet surface. However they are still waiting to be clear glazed so that's all I can comment for now. Good luck. Link to comment Share on other sites More sharing options...
oldlady Posted May 26, 2018 Report Share Posted May 26, 2018 stroke and coat is a glaze. it is not an underglaze. Link to comment Share on other sites More sharing options...
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