Alisa og Claus Clausen on wed 23 jan 02
Glaze test for Leather, cone 6, oxidation.
All tests fired on white, iron flecked, mid-range stoneware.
Fired to cone 6 (1220c) in oxidation.
100c (212f) per hour to 600c (1112f)
150c (302f) per hour to 1100c (2012f)
100c per hour to 1220c (2228f)
15 - 30 minute soak depending on matts and glosses used.
cool down 100c per hour to 900c.
Natural cool down to 150c (approximately 15 hours)
10 Gerstely Borate
27 Custer Spar
12 Neph. Syenite
All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.
Base glaze is a covering white matt, very similar to the WoDo white I use
The painted lines of Burgandy stain, RIO and Cobalt oxide all showed will
under the glaze,
althought he stain should have been applied over the glaze for a better
show. The lines of oxides
have soft edges under the glaze.
The glaze is thick and white, a soft white, not a stark white. It has a
nice smooth feel and is matt without
being dry. It is almost waxy.
1 Cobalt oxide
Very similar to WoDo Blue (Lotte's Blue).
A lavendar blue with darker blues where thinner,
more pink and lavender where thickest. A lot of
nuances throughout the matt surface.
1 Cobalt oxide, 3 Rutile
A mottled light blue glaze with light green splotching.
Although the surface has a lot of color play, over all, it
has a pale blue color. Interesting mild color changes from
pale blue to pale green where thickest and from brown to
dark blue where thinnest.
This was the most surprising.
Resulted in an over all tan glaze with fairly bright but dirty yellow
The glaze is matt but where thickest (yellow), it has a glimmer.
I have seen RIO in many shades of tans and browns and reds, but this is
very yellow, like a summer squash.
Regards from Alisa in Denmark