Joan Berkwitz on fri 22 aug 03
Thank you everyone for the information, even though it was not what I =
was hoping for! Just say the word "explode" and that scares me...my =
precious kiln (its name is "Ur", does anyone else name their kilns? And =
the little one is "Sumer") is not going to be risked in any experiment =
in which the word "explode" could occur!! Yipes!! I will spray lacquer =
or something.
Isn't it funny, they were a lot hotter when formed?=20
Joanie, who doesn't take chances with her best friend, Ur.
lela martens on fri 22 aug 03
What about using a shiny varathane or resin? Much safer and faster. Lela
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Snail Scott on sat 23 aug 03
At 10:18 PM 8/23/03 -0600, you wrote:
>Since rocks survive
>the temperatures generated in pit firings...
Some do, some don't. -Snail
Russel Fouts on sat 23 aug 03
Joan
>>Here's a goofy question...can beach cobbles be glazed? They look so pretty when wet, and dull when dry. It would be fun to glaze them and enjoy their subtle colors. The cobbles on our beach are old river-tumbled granite, and sometimes quartz, in a wonderful variety of colors, with streaks and chunks and spots. What would happen if they were fired to 06? If no one thinks that they would explode or do something terrible, I'll give it a go. And then is it just a matter of finding a clear glaze that will fit? <<
I think that's what rock tumblers are for, tumble, polish, wet look. You
could also try oiling them with some kind of hardening finishing oil or
varnishing them.
Even just red heat can cause the structure of some rocks to change
causing them to crumble or at least discolor. Calcining rocks is one way
to make them easier to crush up for glazes or to add to bodies.
Russel
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Janet Kaiser on sat 23 aug 03
>Isn't it funny, they were a lot hotter when formed?
*** THE MAIL FROM Joan Berkwitz ENDS HERE ***
Well that is one of the unknown factors with your rocks, Joan.
When you collect pebbles off the beach or from a river bed,
unless you are an experienced geologist you usually do not know
which are specifically those hot rocks (igneous, volcanic) or
which are sedimentary (made up of particles like silt, sand,
shells), conglomerates and so on and so forth. There are many
more basic types of rock, but it is a long time since I took
geology 101 :-) Even what appears as "pure quartz" may not be any
such thing. Remember not all rocks were formed from magma and
although some "heatwork" may be involved in some other types of
non-igneous rock, it is usually pressure which formed them.
And even when you follow expert advise (which will also include
informed guesswork) on individual pebbles, there is still is no
way of knowing how much water they contain. Or salt from the
ocean. Or pockets of air and empty spaces. Or fissures and
fractures. Or any number of impurities like lead, iron and so on.
Sincerely
Janet Kaiser -- Right above a beach of lovely smooth cobbles
which used to be taken to make pavements here in the olden days.
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Jeremy McLeod on sat 23 aug 03
So I've been wondering if there's a clear product
that fired in the range of lusters? Since rocks survive
the temperatures generated in pit firings, I'd imaging
that they'd survive something in the 019 range?
Pure conjecture, however.
Jeremy McLeod
Don Goodrich on sun 24 aug 03
Rev. Jeremy wondered:
>So I've been wondering if there's a clear product
>that fired in the range of lusters? Since rocks survive
>the temperatures generated in pit firings, I'd imaging
>that they'd survive something in the 019 range?
>Pure conjecture, however.
>Jeremy McLeod
There is: it's Borax. I've experimented with it as a glaze
for pieces (but not rocks) fired in the kithen fireplace, or
outdoors in the grill. It melts to a glass just fine at those low
temperatures. Hard to keep ash from fusing into it, though.
For some reason, it never occurred to me to try it in the
kiln, where ash isn't an issue. I'd guess that fit would be
a problem, but rocks are cheap and experimentation is fun.
Cheers,
Don Goodrich in hot, dry Zion, Illinois watching the flowerbeds turn
brown
goodrichdn@aol.com
http://members.aol.com/goodrichdn/
Maggie Woodhead on sun 24 aug 03
Hello and Kia Ora,
Why not fire a sample of your rock inside a =
saggar, something like the shape of a cheese cover with its own separate =
base. That way if anything goes awry it will be contained and can do no =
damage. I made one for just such an experiment, it only took a few =
minutes to make, used it green and now have a permanent cover for =
anything doubtful.
Regards and Best wishes Maggie
maggie.w@paradise.net.nz
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