Teresa Gagne on sat 29 mar 08
I would like to use this glaze combo again but get way too many pinholes.
Perhaps the high amount of rutile is the problem (total 15%) or the layering
(wet glaze on dry). Bisque to cone 4 doesn't make a difference. I soak the
kiln - on low for 2 hours (or more) and slow cool, about 75 degrees c. an hour.
Usually I dip the pots in the spearmint green glaze, wax resist a design
and then dip in the rutile glaze. The spearmint glaze has to be dry enough
for me to do this and by the time I've applied wax design to all the pots
all the spearmint glaze would be dry. I wonder if there would be less
pinholing if I work with less pots and then the first layer a bit damp.
Perhaps that has something to do with the pinholing. But then I tend to
muck up the first layer.
Fire to a hot cone 5.
When I mix the glazes together 50/50 in a bucket and dip pots there is no
pinholding. So that's why I suspect the layering might have something to do
with the pinholes. I use Plainsman M370 and M390.
Rutile Glaze, Richard Hehrens ^5 CM Nov.76
Gertley Borate 51
Alumina Hydrate 6.1
Kaolin 10.1
silica 32.8
100
Rutile 9
Spearmint Glaze, from Mastering Cone 6 glazes, Ron Roy, John Hesselberth
Frit 3195 23
Wollastonite 28
Neph Sy 4
epk 28
silica 17
100
copper 4
rutile 6
any suggestions would be appreciated.
Teresa
KATHI LESUEUR on sun 30 mar 08
On Mar 29, 2008, at 3:54 PM, Teresa Gagne wrote:
> I would like to use this glaze combo again but get way too many
> pinholes.
> Perhaps the high amount of rutile is the problem (total 15%) or the
> layering
> (wet glaze on dry). Bisque to cone 4 doesn't make a difference. I
> soak the
> kiln - on low for 2 hours (or more) and slow cool, about 75 degrees
> c. an hour.
>
>
Try calcining your rutile. Just put the powder in a bowl and fire it
with a bisque firing. Doing this eliminated most pinholing and
cratering for me.
Kathi
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