Alisa og Claus Clausen on wed 23 jan 02
Glaze test for Purple Mauve/Strong Pink, cone 6, ox.
Source: Clayart
Credited to: Ababi
All tests fired on white, iron flecked, mid-range stoneware.
Fired to cone 6 (1220c) in oxidation.
Firing ramp:
100c (212f) per hour to 600c (1112f)
150c (302f) per hour to 1100c (2012f)
100c per hour to 1220c (2228f)
15 - 30 minute soak depending on matts and glosses used.
cool down 100c per hour to 900c.
Natural cool down to 150c (approximately 15 hours)
Recipe:
11 3134
12 Silica
18 Calcium Carb. (Whiting)
30 Kaolin
29 Custer Spar
ADD
7.5 Tin
0.32 Chrome oxide
Note:
All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.
Substitutions:
Local frit for 3134
Local Spar for Custer
Resulted in:
Semi matt light, Burgundy pink, with glossy areas where thicker. A
covering glaze where the iron spots came through the glaze noticeably,
speckled but not blotchy.
Will re-test the same sample batch after slurry has had time to saturate
better. Expecting a stronger color.
Did the same test with Whiting replaced with Borax. This is because I had
a momentary blank spot for Calcium carb.
Resulted in a glossier glaze, with a distinctly Celedon green ground, with
very dark Burgundy red areas where thickest.
Will re-test the same sample batch after slurry has had time to saturate
better. Expecting more red color.
Regards from Alisa in Denmark
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