Ron Roy on thu 12 sep 02
ox. plus other colorants to base.
Expansion low when red iron left out - OK with iron for most bosies - low
in alumina - so soap make attack this glaze - I think someone once said of
this type of glaze - don't glaze soap dishes with it - Louis Katz I thnk it
was.
Make two tiles - leave one in the dish washer forever - compare them every week.
RR
>Touchtone Red, cone 6, ox. plus other colorants to base.
>
>Glaze tested on white midrange stoneware fired in electric oxidation to 1220c.
>
>Source: Clayart
>Credited to:
>
>Firing ramp:
>100c p/h to 600c (212f - 1112f)
>150c p/h to 1100c (330f - 2012f)
>100c p/h to 1220c (212f - 2228f)
>cool down max. per hour to 1100c
>cool 80c per hour to 800c
>shut off kiln
>
>Recipe:
>32 Gerstley Borate
>30 Flint
>20 G200
>15 Talc
>5 EPK
>
>ADD
>15 RIO
>
>Note: All raw materials are measured up or down to the nearest whole
>decimal.
>Colorants or additives to a 100 gram test batch are measured in percent to
>the 100 gram test batch.
>
>Substitutions:
>Borax frit for Gerstely Borate
>
>Results:
>15 RIO
>Gloss glaze with many color nuances. Rust brown base with streaking in
>darker browns and slightly green browns. Edges have a bluer nuance. Some
>areas under surface are honey brown. Where very thick, the glaze ran in
>large drips. Moved and pooled where very thick, but otherwise stayed
>where dipped.
>
>5 RIO
>Semi matte glaze that is yellowier where thicker, browner where thinner.
>Many nuances, did not move.
>
>10 Ocher
>Overall yellowish glaze where thicker, shiny. Where thinner, browner and
>matter. Where very thick, it crazed.
>
>3 Cobalt Carb.
>Lavender semi matte glaze where thickest, bluer where thinner.
>
>3 Cobalt Carb. + 5 Rutile
>Medium green semi gloss base with bright, cornflower blue crystals where
>thicker.
>Lovely contrasts.
>
>3 Cobalt Carb. + 5 Rutile + 5 RIO
>Similar to above, but some movement where the edges of glaze are dark
>blue. Glaze is more fluid, instead of distinct crystals like above,
>the lighter blue is in streaks.
>
>Regards from Alisa in Denmark
>
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Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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