search  current discussion  categories  glazes - cone 4-7 

glaze test for desert wash, cone 5-6i, oxidation.

updated wed 23 may 01


Alisa og Claus Clausen on tue 22 may 01

Glaze test for Desert Wash, cone 5/6, oxidation.

Source: Clayart sent by Stephanie S.

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)

50% Borax
50% Zircopax

All measurements measured up or down to the nearest whole decimal.
Substitutions: None

Resulted in a soft looking, but hard as stone rough, textured but smooth =
to touch surface. This slip is very interesting, because you can paint =
it on and then, if you choose to brush some off or scratch into it, the =
slip holds your markings. It can be applied very thickly and I got some =
splitting in the surface, but is very well attached to pot. Looks rocky =
and porous where thickest and whiter and more translucent where =
thinnest. =20

I cannot describe all the variables and nuances of this slip. It is =
very exciting and gives a sublte but screaming gorgeous surface over my =
orange clay body.

8 ochre, 4 rutile
Resulted in a warmer tone on tone, with pinkish spliting and crazing =
where thickest.=20

Stephanie says that it colors well and it is possible to color with =
stains and paints after the firings. It is porous in some areas where =
really thick and I am sure very receptive to that sort of after firing =
handling. Where it came in contact with WoDo white matt, it fused well =
to give yet another surface, a matt, smooth hard surface.

The funny thing about this great discovery for my newer pots, is that I =
did not write this down when I read it. I remembered it wrong, like =
Frit and Borax and said that cannot be right. Then I found it again in =
the archives and tried it as a last test of the day. This is a mix I am =
sure I will make variations of and use a lot of. Thanks Stephanie, who =
says she saw it about 16 years ago and was also sceptical that a 50/50 =
mix could produce desired results.

Best regards,
Alisa in Denmark