Steve’s Copper Red

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Cone: 9 – 10
Color: copper red, green
Surface: glossy
Firing: reduction

Recipe:    (Percent)
Custer Feldspar ………. 42.00
Ferro Frit 3134 ………. 16.00
Barium Carbonate ….  5.00
Whiting ………………… 10.00
EPK ……………………… 10.00
Silica ……………………. 17.00
Totals:            100 %
Also add:
Tin Oxide ………………. 2.00
Copper Carbonate …… 1.00
Bentonite ……………….  2.00

Possible Health Hazards:
Barium Carbonate: HIGHLY Toxic-avoid ingestion.  Glazes containing barium may not be safe for ware intended for use with food – test them for barium release.
Silica: free silica-wear a NIOSH approved dust mask when handling dry material

Estimated Thermal Expansion = 7.04×10-6 /deg. C

Unity Formula for Steve’s Copper Red:
0.163 K2O     0.387 Al2O3    3.476 SiO2
0.169 Na2O    0.191 B2O3     0.002 TiO2
0.575 CaO     0.003 Fe2O3    9.0:1 Si:Al Ratio
0.001 MgO     0.000 P2O5
0.091 BaO

Percentage Analysis for Steve’s Copper Red: (by weight)
62.47 %   SiO2
11.80 % Al2O3
3.97 %  B2O3
4.59 %    K2O
3.13 %  Na2O
9.65 %    CaO
0.01 %    MgO
4.18 %    BaO
0.14 % Fe2O3
0.05 %    TiO2