mhristau Posted October 28, 2016 Report Share Posted October 28, 2016 Nube here. Might someone speculate on the process best suited to achieve a surface like the attached image of an ancient tile (Sumerian?)? Right now I have two greenware tiles made of clay that fires white. I'm planning to paint black underglaze on the greenware and draw into that (exposing white). Then fire to the max temp of the clay? Then apply a matte glaze for a second firing? Any thoughts for me? Appropriate articles? Link to comment Share on other sites More sharing options...
mhristau Posted October 28, 2016 Author Report Share Posted October 28, 2016 OK - I now see that this is a sgraffito technique. Link to comment Share on other sites More sharing options...
Babs Posted October 28, 2016 Report Share Posted October 28, 2016 If you fire to max temp of clay, glaze application will be difficult as you need some porosity of clay to allow glaze to be deposited on clay surface. Link to comment Share on other sites More sharing options...
JohnnyK Posted October 28, 2016 Report Share Posted October 28, 2016 How about bisque firing the carved tile and then glazing with the matte and then firing to maturity? JK Link to comment Share on other sites More sharing options...
mhristau Posted October 28, 2016 Author Report Share Posted October 28, 2016 Thanks — Testing as suggested with underglaze. I read that engobe is often used for sgraffito — not underglaze — but not clear on why. (?) Link to comment Share on other sites More sharing options...
bciskepottery Posted October 28, 2016 Report Share Posted October 28, 2016 Thanks — Testing as suggested with underglaze. I read that engobe is often used for sgraffito — not underglaze — but not clear on why. (?) Engobe, underglaze, oxide washes, colored slips . . . they can all work fine for sgraffito. Depending on application, each may offer a bit of a different look and feel. Mostly, it is a matter of preference. Link to comment Share on other sites More sharing options...
neilestrick Posted October 28, 2016 Report Share Posted October 28, 2016 You can use any sort of underglaze or engobe for sgraffito. Do the carving on the stiff side of leather hard. Bisque fire to low fire temps (cone 06-04), then glaze and fire for the glaze. Your glaze should be formulated to mature at the same temp as your clay, whether low fire, mid range or high fire. Link to comment Share on other sites More sharing options...
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