Roberta12 Posted September 27, 2017 Report Share Posted September 27, 2017 I had a collaborative project with a friend. I made the trays, she applied the black underglaze and did the sgraffito work. I bisqued the pieces to 04 and sprayed them with clear. All of the pieces came out with a white speckling and slight pitting. I have not noticed this effect on my other work with underglaze and clear. But I do not normally use large expanses of black. Does anyone have any thoughts or suggestions? We would love to do more of this work. Roberta Link to comment Share on other sites More sharing options...
Roberta12 Posted September 27, 2017 Author Report Share Posted September 27, 2017 I think I should have made the photo smaller. Sorry Link to comment Share on other sites More sharing options...
Min Posted September 27, 2017 Report Share Posted September 27, 2017 Looks like boron clouding in the whitish/blueish areas. Is the glaze thicker in those areas? Pitting can be from a few things. How clean was your bisque fire, were the pieces stacked in the bisque, vented or not? Could also just need a hold at the top temp to smooth the glaze over. Sometimes it's from overfiring. Since the pieces are all shallow and flat I would look at the possibility of them just not getting hot enough at the end of the glaze fire. I have a low coe clear that works well over black (Spectrum) ug if you want the recipe just let me know and I'll pm it to you. Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted September 28, 2017 Report Share Posted September 28, 2017 I have a friend that's experiencing troubles with black underglaze doing this too. Try refiring it. Maybe more heat work will help smooth things out? Link to comment Share on other sites More sharing options...
dangerouspottery Posted October 9, 2017 Report Share Posted October 9, 2017 Min, I would love the have the recipe for that clear glaze that works over underglaze, if you don't mind. Thank you! Link to comment Share on other sites More sharing options...
Min Posted October 10, 2017 Report Share Posted October 10, 2017 On 10/8/2017 at 9:33 PM, dangerouspottery said: Min, I would love the have the recipe for that clear glaze that works over underglaze, if you don't mind. Thank you! Did you get the PM with the recipes I sent yesterday? Link to comment Share on other sites More sharing options...
dangerouspottery Posted October 12, 2017 Report Share Posted October 12, 2017 I did, thank you so much! Link to comment Share on other sites More sharing options...
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