Ron Roy on mon 2 sep 02
Hi Gene,
This should do it - I've subbed in some MgO to help lower the expansion -
it should look the same - still - a puzzle that it only happens on bowls -
make sure you keep your kiln closed till it cools to 100C as it might
simply be the open forms cooling too fast.
F3134 - 20.0
Neph Sy - 12.0
Talc - 4.5
Wollast - 18.0
EPK - 20.0
Silica - 25.5
Total - 100.0
RR
>>I have a clear cone 6 glaze that works and looks great except on bowls,
>>where it crazes like crazy. All other shapes no problem.
>>
>>I bisque to cone 08 and fire to cone 6, use standards 119 and 181 stoneware
>>clay. I have heard that you can add silica to a glaze to stop crazing, but
>>if you add silica how much and when you add silica do you have to remove
>>some of something else? If so what?
>>
>>Here is the recipe if someone could take a look and see if they can spot a
>>problem I sure would appreciate it !!!
>>
>>Clear cone 6
>>Frit 3134 21
>>Nepheline Syenite 19
>>Wollastonite 20
>>EPK 16
>>Silica 24
>>Gene Arnold
>>mudduck@advi.net
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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