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
Make two tiles - leave one in the dish washer forever - compare them every week.
>Touchtone Red, cone 6, ox. plus other colorants to base.
>Glaze tested on white midrange stoneware fired in electric oxidation to 1220c.
>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
>32 Gerstley Borate
>Note: All raw materials are measured up or down to the nearest whole
>Colorants or additives to a 100 gram test batch are measured in percent to
>the 100 gram test batch.
>Borax frit for Gerstely Borate
>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
>Semi matte glaze that is yellowier where thicker, browner where thinner.
>Many nuances, did not move.
>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
>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
>Send postings to firstname.lastname@example.org
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>Moderator of the list is Mel Jacobson who may be reached at email@example.com.
15084 Little Lake Road