I had already experimented with the effect of using two glaze colours on the dotted pieces. It creates more immediate close up interest though adds another stage to the process; When not fired on (rebisqued) the first colour, whether oxide or glaze tends to smudge and risks looking muddy. I had also been encouraged to use an oxide wash on the carved forms to enhance the texture. I was concerned about this for two reasons. Firstly a strong fluxing oxide such as copper or cobalt can react with the overlying glaze as in this piece, which is bisque fired craft crank, with copper carbonate suspension brushed on then wiped off, rebisqued then glazed in yellow. The copper carbonate was difficult to wipe off, partly because the crank surface is very rough. As seen, after glaze firing, the piece is a pleasant green but not yellow. I have tried again recently. The back left test piece has UcA4 /17 (a green glaze made with copper carbonate and chrome oxide) brushed on and wiped off. The one to the right has a more dilute green glaze with extra copper. The copper settles very quickly in this more watery dilutant and is difficult to apply evenly. All these pieces have been re-bisqued. This image shows the back left form with two layers of the latest red glaze, fired to a little below cone 8 or 1260 degrees C. I really like this effect. Unfortunately it was not a good test of this glaze combination because there is evidence the kiln underfired as the cone was not fully over. It should be rested.
2 Comments
15/10/2022 23:03:54
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15/11/2022 07:09:02
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AuthorI am indulging my passion for ceramics by undertaking studies for an MA at UCLAN Archives
August 2021
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