Lily Krakowski on sat 2 aug 03
Starting like this: pinholes can be caused by dust, they generally are
caused by unhappy gases not able to come out early enough so the glaze does
not heal up well enough.
You already told us you do not overtrim or "polish" the tummies in trimming.
You do not sand the vases.
Is it possible you use a rib A LOT on the tummies and not on the other
parts/pots that do not have the pinholes? Could you be packing the clay
down more on tummies?
Is it possible you put the glaze on thicker on the tummies--not
intentionally but because of the way you put glaze on?
My last guess is a weird one, and everyone is welcome to scold: The other
shapes you mention all seem flared or open. Vases generally are bottle
shapes. Is it possible--experts please opine-- that enough gas is trapped
INSIDE a narrow necked bottle to cause some kind of interaction with the
outside?
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Kathi LeSueur on sat 2 aug 03
mlkrakowski@CITLINK.NET wrote:
> Starting like this: pinholes can be caused by dust, >>
I wash all of my pots before glazing.
>
> Is it possible you use a rib A LOT on the tummies and not on the other
> parts/pots that do not have the pinholes? Could you be packing the clay
> down more on tummies?>>
I use a rib minimally on vases, and when I do use a rib it's on the
inside of the form (where I never get pitting). I do use a rubber rib on
the inside of bowls to finish the surface and don't have this problem/
> Is it possible you put the glaze on thicker on the tummies--not
> intentionally but because of the way you put glaze on?>>
Unlikely. I pour the inside and dip the rim about 1" down. Then when dry
dip the lower portion with very little overlap.
> My last guess is a weird one, and everyone is welcome to scold: The
> othershapes you mention all seem flared or open. Vases generally are
> bottle shapes. Is it possible--experts please opine-- that enough gas
> is trapped INSIDE a narrow necked bottle to cause some kind of
> interaction with the outside?>>
These are not narrow necked vases-about a three inch opening.
Don't you just love a challenge. I've been trying to solve this one for
a long time and would dump the glaze but it's extremely popular with my
customers.
Kathi
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