Jim V Brooks on thu 19 apr 01
Mel,, are you saying that the soda ash will migrate if the piece is let
sitting on the shelf for a dfew days..?.. Will it migrate even if the pot
is dry? Jim in Denton.
mel jacobson on thu 19 apr 01
merrie and others.
the longer shino sits on the shelf after glazing, the more
the soda ash works to the surface. if you cover it, well,
it slows the migration down.
when you apply soda ash hot on the surface..well, there
it is.
i like to glaze shino about a week ahead.
but, if you apply hot soda ash...just fire it, right now.
we do that at the farm..have the glaze buckets in front
of the kiln, glaze, load. `hey, who has the smart pills?`
drives kurt nuts.
he calls it `japo, slapo`. no planning, no templates.
of course, we do it just so he goes nuts.
it is a plan.
mel
From:
Minnetonka, Minnesota, U.S.A.
web site: http://www.pclink.com/melpots
Tom Buck on sat 21 apr 01
Jim VB:
yes that is what mel is saying/....when you add soda ash to a
glaze slurry the sodium carbonate dissolves...it goes into solution in the
water. When you glaze with this slurry the water (with Na+ & CO2-- ions)
percolates into the pores of the biscuit, and then as the glazed pot sits
and dries, the water (with the Na+ and CO3-- ions) comes to the surface to
evaporate into the atmosphere, leaving behind the soda ash (recombined
from the ions) on the surface of the glaze coat. Naturally, some of soda
ash stays in the pores but most of it comes to the surface.
til later. Peace. Tom B.
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
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