Christina Zola on thu 2 nov 00
The explanation i've received for vinegar on bone dry ware is this: water
won't work on bone dry, being water... the drying properties of the watered
slip will simply cause further cracking and damage. Vinegar, on the other
hand, is not water. If you mix vinegar with finely crushed, bone dry clay
and use that slurry to join and repair bone dry ware, the slurry will do its
adhesive job, and the vinegar evaporates very rapidly, unlike water. I
don't think the worms have anything to do with it, though the image of the
little industrious creatures furiously repairing your pot is amusing.
Corn syrup is an altogther different matter. Only instance in which corn
syrup or karo syrup is used in the studio where i work is when a pot is
overfired in the bisque kiln. A little of the viscous stuff mixed in with
your glaze, then applied to a warm pot, helps the glaze adhere to a
not-so-porous pot.
TADA! all this to say what Steve said: It works because it works.
Michael Sowers on thu 2 nov 00
I have never used corn syrup but I did share studio space with another
potter that used it not to repair cracks or attach handles but as part of
his glazing procedure. He would glaze a bisque pot with a celadon glaze and
then, using a hand spray bottle with a mix of water and karo syrup, spray
the glazed pot. This would give a "candy coating" to the unfired glaze that
allowed him to paint on the surface without it being like drawing on toilet
paper with a magic marker. Nice fine lines using colorants made with water,
clay, glycerin, and oxides.
Michael Sowers
www.classiclines.org
www.classiclinespottery.com
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