Jim Tabor on thu 14 feb 02
Mariko-
I'm posting this because it did not deliver off the list.
??
Greetings Mariko-
Do the edges appear to be slightly healed over as being rounded? What
you describe
does not sound like any of my observations. Several student's tests this
week are changing
every day with additional crazing. My microscope (50X) is at school but
I'll
check on the crazing tomorrow and let you know what I see. We get the
gamut of
results in the bases as they are to note a 100 gram batch to blend and
test. I
check their notes before they make the glaze and we discuss the fired
results.
Some work from scratch and others start from ^10 or ^06 bases and adjust
to what
they think will work when fired to ^1. More guesswork and speculation
than
science. I don't want them just testing published glazes but keep their
mind and
eyes open to discovery. Although they are not required to adjust their
tests to
make them more workable, everyone has extended their tests with
adjustments and some
move on to colorants. They get into the testing more than I expected. I
have a
small test kiln that is fired every day.
I will bring my microscope to NCECA to show you if you are there. Bring
examples if you can.
My microscope is from Germany with good optics, a pen light angled from
above, and adjustable measurements at .002mm. A 10X loop is also handy
to have.
jt
http://home.earthlink.net/~taborj/index.html
> Dear Jim.
>
> I did send a copy to Ivor at iandol@tell.net.au. Hope he gets it.
>
> You mentioned about your microscopic observations on "Bubbles". What
is
> your scope objectives' magnifications?
> When I was looking at crazed areasof pots under my 'scope, which is
30X, the
> crazing lines were bulged up, as if the glaze was once crazed, but
later it
> tried to smooth out and couldn't for some reason. Of all the crazing
lines
> I looked at, there was no exception. Can you explain this
phenomenon?
>
> Mariko Cruse
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