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expansion tests

updated sat 18 may 02

 

Ababi on fri 17 may 02


Hello Ron John and the readers of "Mastering cone six glazes"

I send the letter to the list as I think more of you might arrive to
this conclusions or mixed up like me!
After the next paragraph I shall write wider
========================================
I want to see if I might arrive to this conclusion.
Different expansion glazes , (not the extreme ones, for this
conclusion) might work fine on a given claybody if they were applied
differently or with different coloring oxides or to different thickness
of claybody or glaze.
========================================
According to the expansion tests in Mastering cone six glazes. I tested
the relevant claybodies. One claybody, fail all the way. The commercial
claybodies were fine with expansion glazes 1-4.
I tested on small pinched bawls, hoped to see the shivering-crazing
better.
I made the hardest tests reloaded by J&R glaze no 5 was bad. to the
first four glazes nothing happened.
I tested again, this time less claybodies, and only glazes 1-4
according to the tests tiles I had I used only light colored test
tiles. This time on flat tests tiles. Again the most violent tests.
I keep the tests bar perhaps the shivering of the low expansion glazes
will start or is it another test? Can I dropped them from 200C to water?

So again for your convenient the first paragraph again

I want to see if I might arrive to this conclusion.
Different expansion glazes , (not the extreme ones, for this
conclusion) might work fine on a given claybody if they were applied
differently or with different coloring oxides or to different thickness
of claybody or glaze?

Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm