Val Posted February 7, 2016 Report Share Posted February 7, 2016 Not sure if this question should be here or in glaze chemistry. I usually use Amaco Velvets on my stoneware greenware, then bisque and glaze fire. When there are small touch ups needed after bisque, I can usually do the touch up and go ahead with glaze, however if the touch up is large, such as when a large space needs a whole new coat of u.g., then I usually re bisque because the glaze absorbs different;y on the new application. Recently I had a whole kiln load to touch up so I did a hardening on after bisque but before glaze firing at cone 022. However I forgot to take out the electric kiln's bungs. Many colors went VERY UGLY ! I am not sure if the reason is oxygen starvation of just not reaching a mature temperature?? Thanks Val Link to comment Share on other sites More sharing options...
bciskepottery Posted February 7, 2016 Report Share Posted February 7, 2016 Probably not reaching mature temperature. I fire my Velvets in electric oxidation with bungs/peeps in, lid closed, and vent operating. I believe if you dampen the fired underglaze with water, you should be able to see how the color will look at maturity. Link to comment Share on other sites More sharing options...
Min Posted February 7, 2016 Report Share Posted February 7, 2016 I had the same thing happen. I touched up some Spectrum neon orange underglaze on 04 bisque, refired really low to burn off the binders and the touched up bits came out coffee coloured. Thought I used a dirty brush so tossed the pots. Did it again with other pots, same coffee colour, went ahead and glazed them and they came out the proper colour. Link to comment Share on other sites More sharing options...
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