Alisa Liskin Clausen on sun 22 oct 06
Glaze test for Barium Blue, cone 6, ox.
Source: Clayart
Credited to:
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 1 hour
Shut off kiln
Recipe:
30 Barium Carb.
65 Nepheline. Syenite
7 OM-4 Ball Clay (used English Ball Clay)
8 Flint
3 Lithium Carb
113
ADD
3 Copper Carb.
Note: All raw materials are measured up or down to the nearest half
decimal. Colorants or additives to a 100 gram batch are measured in percent
to the 100 gram batch.
Results:
Mat, opaque, strong Turquoise blue. Bright blue spots where breaking, but
minimal
Gram for gram substitution of Barium with Strontium
Same surface, color almost the same, slightly lighter. No noticeable bright
blue speckles
(The MW sub. for Barium to Strontium is 100 gr. Barium is equal to .75
Strontium)
I think this color response with Strontium in this glaze is good enough to
revise this recipe with the Strontium for the Barium.
Regards from Alisa in Denmark
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