Stephen Sell on tue 22 oct 96
I'm new to Raku and have fired some lovely pots using a copper penny glaze.
Unfortunatly after a couple weeks they appear to be re-oxidizing -- HELP.
Jeff Lawrence on tue 22 oct 96
>----------------------------Original message----------------------------
>I'm new to Raku and have fired some lovely pots using a copper penny glaze.
>Unfortunatly after a couple weeks they appear to be re-oxidizing -- HELP.
>
Try reading Tom Buck's article on raku glazes on http:\\www.digitalfire.com
He addresses this very problem and suggests some glaze alterations that
help. Good luck!
Jeff Lawrence
jml@sundagger.com
Sun Dagger Design, Route 1 Box 394L, Espanola NM 87532
vox/fax: 505-753-5913
"When all is said and done,
there's a lot more said than done"
lrh on tue 22 oct 96
RIGHT... YOU'RE NOT IMAGINING THINGS... THOSE BEAUTIFUL COLORS
THAT LOOK LIKE THE RAINBOW HUES OF OIL ON WATER ARE, INDEED,
RELATED VERY CLOSELY TO THAT EFFECT. LIKE OIL, THE LAYER OF
COPPER THAT IS CAUSING THE COLOR IS LAYING RIGHT ON THE SURFACE
AND IS SO THIN THAT IT ALLOWS LIGHT TO PASS THROUGH IT. WHEN THIS
BEAM OF LIGHT REFLECTS BACK UP THROUGH THE COPPER FILM, IT MEETS
THE INCOMING LIGHT WAVES AND EITHER CANCELS OR AMPLIFIES THE
LIGHT FREQUENCIES, THUS THE COLORS! BECAUSE NATURE GAVE US A VERY
REACTIVE ELEMENT TO BREATH, THIS THIN LAYER OF COPPER COMBINES
WITH OUR "O" TO RETURN TO AN OXIDE OF COPPER. NOTHING CAN STOP
THIS BUT ONE CAN SLOW IT DOWN A BIT. TRY SPRAYING THE POT WITH A
CLEAR LACQUER OR ENAMEL. THIS WILL PLACE A BARRIER BETWEEN COPPER
AND THE OXYGEN AND WILL PROLONG THE COLORS. ( IT ALSO DULLS THEM
A BIT, DEPENDING ON THE BRAND AND THICKNESS) KEEPING IT OUT OF
DIRECT SUNLIGHT WILL HELP ALSO. JUST BECAUSE IT ISN'T A FOREVER
EFFECT HASN'T KEPT THOUSANDS OF RAKUNUTS FROM PRODUCING AND
ENJOYING THIS BEAUTIFUL EFFECT...LRH@DELTAFAUCET.COM
______________________________ Reply Separator _________________________________
Subject: Raku Copper re-oxidation
Author: Ceramic Arts Discussion List at ccmgate
Date: 10/22/96 1:00 PM
----------------------------Original message----------------------------
I'm new to Raku and have fired some lovely pots using a copper penny glaze.
Unfortunatly after a couple weeks they appear to be re-oxidizing -- HELP.
June Perry on wed 23 oct 96
Dear Stephen:
You can spray them with a fixative that can be purchased at any art supply
store. Make sure you get the one that covers best to prevent fading. My store
had two types and they suggested one over the other because it gives better
coverage and prevents fading by not letting as much light in. Anyway, that is
what I was told. I have yet to try it but I know that others have and it is
supposed to be quite effective. These products are made to be used over
charcoal drawings, etc. I'm not in my studio otherwise I could give you the
brand name of the one that they recommended.
The other alternatives would be to reduce the pots in the kiln as well or to
just refire your pots.
Good luck!
June
Bruce Johnson on thu 24 oct 96
>----------------------------Original message----------------------------
>Dear Stephen:
>
>You can spray them with a fixative that can be purchased at any art supply
>store. Make sure you get the one that covers best to prevent fading. My store
>had two types and they suggested one over the other because it gives better
>coverage and prevents fading by not letting as much light in. Anyway, that is
>what I was told. I have yet to try it but I know that others have and it is
>supposed to be quite effective. These products are made to be used over
>charcoal drawings, etc. I'm not in my studio otherwise I could give you the
>brand name of the one that they recommended.
>
>The other alternatives would be to reduce the pots in the kiln as well or to
>just refire your pots.
>
>Good luck!
>June
>
Hi June I would be interested in the names of the fixatives. I have used
Blair with good results but sometimes the can messes up and shoots a alot at
once out and messes up the piece and the only way to get rid of it is to
refire it which if it was a big piece is not good. Also have used a grout
sealer called Jasco which is a silacone based and that goes on nice and
doesn't seem to change my work it just sucks right in. But don't know if it
works only told by other potters that it is to suppose to TIME WILL TELL.
What about the in kiln reduction how Long? Also I think firing them hot and
not torching them helps
I like to flatten a large 05 cone in about 30 minutes.
HAPPY LIGHTINGS bruce madtown wi.>
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