Alisa Clausen on wed 2 may 07
Glaze test for Altered Conrad Engobe, Cone 6, Ox.
Source: Ceramic Arts Buyers Guide, 2007, 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.
Drop Neph. Sye. for very dry.
Add 10% Black Stain, sponge off.
26 Nepheline Syenite
17 Ball Clay--Old Mine #4
Dry, white engobe. Did not see significant difference in surface with
absence of Nepheline Syenite.
Best regards from Alisa in Denmark