Fara Shimbo on sun 27 jan 02
Hi, Ivor, and everyone else who answered my post re
measuring crazing.
What'd I'd been meaning to do is this: I have lots
(and lots!) of test tiles of all my glazes on various
different bodies. I was going to color the crazes with
india ink, then use a lapidary set to cut the tiles in
half, then cut off a slice I can polish (to see details)
and put the whole under this cool little computer microscope
I've got. I want to measure not only how many crazes
there are per, say, three centimeters on average, but
also how far the crazes penetrate into the clay itself.
I can easily make up a ruler I can use with the microscope.
What I'm aiming to find out is, which glazes work best
with which clays; which glazes have the least crazing
compared to others; and which do the least damage to
the clay when they do craze.
What I don't want to do is reinvent the wheel if there
is already some accepted measuring technique.
By the way, I know some folks are looking for a clay body
that crystalline glazes *won't* craze on, and I think I've
found one. Alas so far I've only used it for casting because
it has no plasticity to speak of, and it's not white; but
I glazed it with my Faux Favrile/Silver glaze and five
Egyptian cats have not crazed... yet...
Recipe Is:
35 parts Kona Feldspar
30 parts Grolleg
20 parts Silica
10 parts Tennessee Ball Clay
5 parts EPK
I fire it up to cone 8 and it works fine, though I'd
like to come up with a mix with the same properties
that's a little whiter.
Fa
--
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Fara Shimbo, Certified Public Nuisance, Master Crystallier
Route 66 Ceramics, Hygiene, Colorado, USA
crystalline-ceramics.info ++ crystalglazes.info
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
"It's great to be known. It's even better to be known
as 'strange.'" -- Kaga Takeshi
| |
|
