Fernwood Posted September 17, 2018 Report Share Posted September 17, 2018 Oops, I am a new potter and accidentally used Custer Feldspan instead of Soda Feldspar. What should I do? Thanks! cone 6 2000g Batch Gerstley Borate 634g Flint (Silica) 594g *asked for Soda Feldstar used Custer Feldspan 396g Talc 277g EPK 99g Link to comment Share on other sites More sharing options...
C.Banks Posted September 17, 2018 Report Share Posted September 17, 2018 In many cases soda and potash feldspar are interchangeable in glaze recipes. happy accidents are fun - and frustrating :) Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted September 17, 2018 Report Share Posted September 17, 2018 It may affect things like colour response, particularly if you’re using copper. Sodium is needed to push copper towards a turquoise colour, rather than something more green. And it might make a difference in your glaze fit, depending on how well the original glaze fit your clay in the first place, although as noted in the article above, probably not a big difference there. Link to comment Share on other sites More sharing options...
Mark C. Posted September 17, 2018 Report Share Posted September 17, 2018 I do not fire to cone 6 so its a test and see deal.Now that you have mixed it try it. In high fire (cone 10) most of of all my glazes uses potash feldspar. Which for most is custar. For me its a lifetime supply of Kingman feldspar I bought in 1982 as they closed the mine. Link to comment Share on other sites More sharing options...
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