Alisa og Claus Clausen on mon 25 jun 01
Glaze test for variations of 50/50 Borax slips, cone 6, ox.
Source: Alisa Used Desert Slip (50 Borax, 50 Zircopax as a jumping off =
place).
Idea was to find other slips that give a rough but hard surface and will =
color well for
outside decorative use on textured surfaces. =20
Tested on light, mid-range stoneware, with iron flecks. Fired to 1215c =
(22219) oxidation, at this ramp:
100c to 600c 212f to 1112f
150c to 1100c 300f to 2012f
100c to 1220c 212f to 2228f
soak at 1220c for 30 minutes =20
cool down 100c per hour to 900c (212f/1652f)=20
soak at 900c for one hour
shut off and cool down (aprox. 40 hours)
Recipe:
50 Borax
50 Zinc Oxide
Resulted in a smooth, hard, semi mat glaze. Base color is white, with =
some yellow spotting. =20
Colored with ochre resulted in same with more of a yellow color.
50 Borax
50 Ball Clay
Resulted in a dry slip, with small pebbling in surface. Raw white color =
with some orange.
Colored with ochre resulted in the same with a darker orange color.
50 Borax
50 Kaolin
Resulted in a super dry slip with a hard and rough surface. Raw white =
in color.
Colored with ochre resuted in the same but with a very orange and toasty =
color.
50 Borax
50 Tin oxide
Resulted in a very similar slip as above, but deep richer in color. =
Surface is
smoother.
50 Borax
50 Magnesium Carb.
Resulted in a dry glaze with surface that has a sparkle where thicker. =
Some small bubbling where very thickly applied.
Base color is raw white with toasty nuances.
Colored with ochre resulted in similar to the above but overall toasty =
brown.
=20
50 Borax
50 Dolomite
Resulted in a dry slip that is raw white and tosty in color.=20
Colored with ochre resulted in a dark toasty brown semi mat.
50 Borax
50 Whiting
Resulted in a veyr dry slip toasty in color.
Colored with ochre resulted in similar to above but darker in color.
50 Borax
50 Titanium Oxide
Resulted in a dry slip that is pebbly and smooth.
Base color is raw white with toasty nuances.
Colored with rutile resulted in same but darker overall.
25 Borax
25 RIO
50 Ball
Resulted in a dry, oversatured iron brown slip. Very dry with some =
peblling where very thick.
All of the above tried with clear glaze over. All trials fit the glaze, =
enhancing the
iron spots in clay and bringing up more color and movement in the slips' =
surface.
It is easy enough to make your own experiments with one tablespoon full =
Borax to
one tablespoon full of any refractory material of your choice. The =
Zinc, acting both as an opacifier and flux,
made a glaze.
In the future, I will try a mix with silica,
perhaps 20 Borax, 30 Silica and 50 variable.
Best regards,
Alisa in Denmark
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