Alisa Clausen on wed 2 may 07
Ox.
Glaze test for Lana 's Red Moss Glaze, Cone 06, Ox. fired to Cone 6, Ox.
Source: Ceramic Arts Buyers Guide, 2007
Credited to: Lana Wilson
Fired on mid fire white stoneware
Firing ramp with an electric controller is:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)
80c p/h to 1220c (176f - 2228f)
15 min. soak
cool down max. to 900c (1652f)
Hold 30 minutes
Shut off kiln
Colorants or additives to a 100 gram batch are measured in percent to the
100 gram batch.
Substitutions in this test: Frit 3134 subbed with local Boron Frit,
Feldspar used is Forshammer, Boron Frit is subbed for Gerstley Borate. All
substitutions are done not by Mol. Wts., but gram for gram.
Amount Ingredient
60 Lithium Carbonate
40 Talc
0
100 Total
Additives
2 Bentonite
2 Frit--Ferro 3124
6 Manganese Dioxide
Manganese: 3% for light orange, 6% for strong orange and 10% for a dark
red.
Apply thickly, up to 1/4 inch to yield red. Thinner yields black.
Unity Oxide
.691 Li2O
.002 Na2O
.256 MgO
.052 CaO
1.000 Total
.001 Al2O3
0 Fe2O3
.316 SiO2
302.2 Ratio
5.3 Exp
Results:
Looking at the two materials that make up this glaze, an Alkali Flux and an
Alkaline Earth Flux, one would and I did, put the test tile on a plentiful
under surface, firing at Cone 6!
I wanted to test Glaze Chemistry theory, and see the fluxes interact with
nothing else to stiffen the glaze. As pretty much expected, the glaze ran
off the test tile (which was only glazed 1/3 of the way down) and pooled at
the bottom edge of the upright tile. I was just interested to see how much
two beige and rust brown.
Best regards from Alisa in Denmark
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