Lari Ward on tue 20 may 97
I have been trying to use David Roberts resist slip in raku and am getting
poor results. I am using the folling slip: Grolleg 3 parts, Flint 2
parts. I bisqued to 06, using a low fire white clay with sand. I put the
slip on about 1/4", covered it with my 80/20 clear and fired to 1850. The
techniqued I read about used a different glaze over the slip. Carving
through the slip gave great carbon on the clay, otherwise the crackle was
not real clear. The problem was SCRAPING it off. This was an effort. I
also used a recipe that called for 85% grolleg and 15% CUCO3. I now
believe it was a typo and needed the flint as I have a very nice piece with
vitrified slip. Does any one have any suggestions? Different slip? How
thick? Do I need to put a clear glaze over? Is it supposed to be
difficult to get it off? Should I fire lower, slow? Reduce for how long,
spray with water? Thanks ahead of time. Lari in Poulsbo, Wa and it's been
in the high 70's for a week 1/2. I think I'm dreaming, maybe it's to make
up for the 3 feet of snow this winter.
Jasper Stil on thu 22 may 97
------------------
On Tue, 20 May 1997 11:59:20 EDT, you wrote:
=3E ----------------------------Original message----------------------------
=3E I have been trying to use David Roberts resist slip in raku and am =
getting
=3E poor results. I am using the folling slip: Grolleg 3 parts, Flint 2
=3E parts.
Hi Lari
For the whole slip/glaze to peel off easily, you need more silica.
I make the slip out of : 3 parts flint
2 parts kaolin
Just remember too much silica makes it too easy to peel off, not enough =
makes
you scrape and ruin your pot- so ajust until you get it right.
A thick layer of slip and a glaze with :
Frit 3110 65
Gerst. Bor. 35
work nice and easiest for me.
You can of course carve through the slip but you can also get beautiful =
natural
crackles by delaying a bit putting your pot in a reduction chamber.
There are also other possibilities with other glazes, but I'd rather stay =
with
the simplest ways.
Good luck
Marie Claire
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