Janet H Walker on fri 20 mar 98
Hi Penny. You asked about techniques for using Mason stains as
underglazes:
...3- Just CMC, water and stain...
I'm one of those folks who uses method #3.
For the CMC, you want to mix up a jar of "CMC liquid". Take 30g
of CMC powder and add it to a quart of hot water. Shake like mad
and then leave it for two days. It takes that long for the stuff
to really glob up (I don't think it dissolves; I don't know what
the technical name is for what it does!!). After that, you can
just add the CMC water to wet the stain. Maybe a teaspoon of stain
with a teaspoon of CMC water. Enough to suspend.
I've done it this way and it is easy. I've tried several recipes
for mixing an underglaze medium and they have not worked out as I
hoped (e.g. stain was the wrong color and tended to bleed into glaze).
I've also been told that instead of CMC one can use glycerin (get
it at a pharmacy) or acrylic medium (the stuff that painters use
when adjusting their acrylic paints to taste).
The main thing you want is something that holds the stain fairly
evenly, lets the stain flow off the brush onto the clay without
sticking or dragging, keeps the stuff from drying so fast that you
can't make the designs you want, and gives a hard surface on the
pot so that the stain won't smudge around when you glaze it or pick
up the pot.
other than that, it's just a piece of cake...
Hope this makes sense.
Jan Walker
Cambridge MA USA
Judith Enright on sat 21 mar 98
Just thought I'd mention that acrylic gloss medium acts as a RESIST. I've
mixed colorants with it and applied the mix to the rims and feet of bisqued
bowls, then glazed as usual.
That's it for now...
Judith Enright @ Black Leopard Clayware
email: BLeopard@ricochet.net
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