Tom Wirt on fri 12 mar 99
Sorry gang.....used the wrong term in this paragraph
>>>>>Chris,
You could try flocculating the glaze a bit with some vinegar (maybe a
teaspoon) and then warming the glaze (Hamer says this encourages a type of
flocculation.) Assuming these two work, after the water's off, you'll have
to go about deflocculating the glaze again. If you've been using Epsom
>>>>>salts, you might try switching to Darvan7.
The reference to Epsom salts should imply that Mag. Sulfate is a
flocculent.....and often used to thicken a glaze (flocculate it)
erroneously. If you use too much it will have a reverse effect and
deflocculate the glaze. Glazes should be mixed as thickly as possible and
then deflocculated with Darvan7 or other alkaline material to working
consistency.
See Hamer & Hamer on this one ACID, ALKALI, FLOCCULENT, DEFLOCCULANT.
Basically acids usually give flocculated suspensions, while alkaline
materials give deflocculation. You generally want a glaze deflocculated so
there is as much material suspended in as little water as possible (this is
a rule of thumb so don't jump me here). Excess water (along with other
factors) can cause excess shrinkage, which in turn can cause cracking and
crawling.
I'm new at this, so Ron, Tom, Michael, someone jump in here if I've screwed
it up.
Tom Wirt
| |
|
