Nick Molatore on tue 1 oct 02
Thanks, but I wanted to avoid formldehyde because it is so toxic. =20
Clorox is a good idea but I think it works by oxidizing organic compound =
(including germs) and so it would
oxidize the gum. Hmm....
-Nick
----- Original Message -----
Nick,
Some older sources I have seen call for formaldehyde.
I have just tried a different gum, and added some chlorox to see =
what
that might do. CMC does get stinky, and I assume loses its efficacy =
when it
decays.
Regards,
Dave Finkelnburg on a drizzly fall day in Idaho
----- Original Message -----
From: "Nick Molatore"
To:
Sent: Tuesday, October 01, 2002 10:17 AM
Subject: Glaze preservative question
I have just started using gum (CMC and/or Veegum Cer) in some of my =
glazes.
What can I do to keep them from spoiling? What can I use for a
preservative?
Any help would be appreciated.
-Nick
Ababi on wed 2 oct 02
Two ways:Mix the glaze with the CMC in small amounts for a month or so.
The other way: Keep in the refrigerator
Ababi
Nick Molatore on thu 3 oct 02
It is not the CMC solution that is spoiling, it is the glaze containing =
it. =20
Get awful stinky after a month or two.
I am reluctant to use formaldhyde because it is very toxic and =
carcinogenic.
-Nick
>>>>>>>>>>>>>>>
Two ways:Mix the glaze with the CMC in small amounts for a month or so.
The other way: Keep in the refrigerator
Ababi
Ababi on fri 4 oct 02
It is true, the glaze cause the CMC to be smelly, but the result is the same!
---------- Original Message ----------
>It is not the CMC solution that is spoiling, it is the glaze containing it.
>Get awful stinky after a month or two.
>I am reluctant to use formaldhyde because it is very toxic and carcinogenic.
>-Nick
>>>>>>>>>>>>>>>>
>Two ways:Mix the glaze with the CMC in small amounts for a month or so.
>The other way: Keep in the refrigerator
>Ababi
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>You may look at the archives for the list or change your subscription
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Dave Gayman on fri 4 oct 02
Anything you use will be toxic in enough quantity.
On the natural side, maybe try vinegar or ascorbic acid (vitamin C)? The
glaze mix probably has to be appreciably acidic for this to work -- like a
pickling brine solution.
Also, thymol (thyme extract), available from laboratory supply
places. Again, not sure how much to use. You don't want Thymol Blue,
which is a reagent used for Ph testing. While it's natural, thymol is very
toxic and not to be messed with.
On the synthetic side, there's a widely-used gum/glue/paint/leather
preservative that's also certified for many other kinds of water- and
alcohol-based solutions, Bayer's Preventol ON extra,
natrium-2-phenylphenolate.
Frankly, I wouldn't use it in a glaze solution in which you dip your hands.
But, it's in many a substance you use, if you use glues, paints, paper,
leather goods, and cosmetics. Used in amounts from 0.2% to 0.5% (1/5 to
1/2 of 1%) by weight. Available retail from a pigment supplier, Kremer
Pigments, because home-brewed watercolors and some acrylic paints sometimes
need preservatives. It's found on the following
page: http://www.kremer-pigmente.de/englisch/chemic03.htm#additives
Handle with OSHA-grade mask and use in a well-ventilated area -- the
labelling from Bayer, which you won't get from Kremer, tells me it's
-- harmful if swallowed
-- risk of serious damage to eyes
-- very toxic to aquatic organisms
-- irritating to eyes and skin
-- classified as "harmful" and "irritant"
Dave
At 08:32 PM 10/3/2002 -0700, you wrote:
>It is not the CMC solution that is spoiling, it is the glaze containing it.
>Get awful stinky after a month or two.
>I am reluctant to use formaldhyde because it is very toxic and carcinogenic.
>-Nick
>
> >>>>>>>>>>>>>>>
>Two ways:Mix the glaze with the CMC in small amounts for a month or so.
>The other way: Keep in the refrigerator
>Ababi
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
Marianne Lombardo on fri 4 oct 02
I've got some glazes that I mixed using CMC a long time ago. Even though
they smell, as far as I can tell they still work just fine. I can't say
that I've noticed any difference. I just keep them in plastic buckets with
tight-fitting lids. Of course, a lot of my clay is pretty stinky too so
maybe I'm just used to the smell.
Marianne Lombardo
Omemee, Ontario, Canada
email: mlombardo@nexicom.net
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