search  current discussion  categories  glazes - cone 4-7 

glaze test for oil spot daly ^6 ox.

updated thu 5 jun 08


Alisa Clausen on wed 4 jun 08

Recipe Name: Oil Spot Daly

Cone: 6 Color:
Firing: Oxidation Surface: Oil Spot

Amount Ingredient
35 Feldspar--Custer
26 Silica
9 Whiting
9 Talc
9 Kaolin--EPK
15 Frit--Ferro 3195

103 Total

9 Iron Oxide--Red
2 Cobalt Carbonate

Unity Oxide
.12 Na2O
.139 K2O
.251 MgO
.49 CaO
1.000 Total

.405 Al2O3
.186 B2O3
.004 Fe2O3

4.063 SiO2
.001 TiO2
0 P2O5

10 Ratio
6.5 Exp
Comments: A blue ground with a brown shell, showing tea dust like spots
scattered overall.

Glaze test for Oil Spot, Daly ^6 ox.

Source: John Britt

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.
Standard Substitutions in all tests IF called for in recipe:
Local Boron Frit is used for Frit 3134
Forshammer (a half and half Potash and Soda spar) is the only Feldspar used
Local Boron Frit is used for Gerstley Borate
All substitutions are done not by Mol. Wts., but gram for gram.