TMartens on fri 20 feb 98
I prefer to use cobalt carbonate because I have found that the oxide
causes little streaks of dark, dark blue in the glaze.
Cobalt oxide is what I have to work with at present so I would like
to know if anyone else has had this streaking problem and if there is
a way of dealing with it.
Toni in Durban South Africa where the heat is back after a week of
blissfully cool weather.
McCoy, Jack Eugene on sat 21 feb 98
I also have experienced streaking with cobalt oxide. A friend told me
that sieving the glaze will eliminate the streaks. I happen to like the
streaks, so I haven't bothered to try it.
Good luck.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
=-=-=-=-=
Jack McCoy
Systems Programmer
East Carolina University
Voice: (919) 328-6855
Fax: (919) 328-4258
email: mccoyj@mail.ecu.edu
> ----------
> From: TMartens[SMTP:tmartens@falcon.mweb.co.za]
> Reply To: Ceramic Arts Discussion List
> Sent: Friday, February 20, 1998 8:19 AM
> To: Multiple recipients of list CLAYART
> Subject: Cobalt Oxide--streaking
>
> ----------------------------Original
> message----------------------------
> I prefer to use cobalt carbonate because I have found that the oxide
> causes little streaks of dark, dark blue in the glaze.
> Cobalt oxide is what I have to work with at present so I would like
> to know if anyone else has had this streaking problem and if there is
> a way of dealing with it.
> Toni in Durban South Africa where the heat is back after a week of
> blissfully cool weather.
>
Christine Pereira on sat 21 feb 98
Toni:
I have found that putting the glaze through a 100-120 mesh sieve will
correct that problem.
Chris Pereira
fennimor@spot.colorado.edu
-----Original Message-----
From: TMartens
To: Multiple recipients of list CLAYART
Date: Friday, February 20, 1998 6:31 AM
Subject: Cobalt Oxide--streaking
>----------------------------Original message----------------------------
>I prefer to use cobalt carbonate because I have found that the oxide
>causes little streaks of dark, dark blue in the glaze.
>Cobalt oxide is what I have to work with at present so I would like
>to know if anyone else has had this streaking problem and if there is
>a way of dealing with it.
>Toni in Durban South Africa where the heat is back after a week of
>blissfully cool weather.
Dannon Rhudy on sat 21 feb 98
There's been quite a bit on this before, but glazes with cobalt
oxide have to be sieved, in my experience, with a fine sieve,
or specks and streaks will be there.
Dannon Rhudy
potter@koyote.com
----------------------------Original
message----------------------------
I prefer to use cobalt carbonate because I have found that the
oxide
causes little streaks of dark, dark blue in the glaze.
Cobalt oxide is what I have to work with at present so I would
like
to know if anyone else has had this streaking problem and if there
is
a way of dealing with it.
Toni in Durban South Africa where the heat is back after a week of
blissfully cool weather.
Cindy on sat 21 feb 98
Toni,
I *like* streaks, but I believe that sieving your glaze will help. Or maybe
it would be easier for you to simply mix the oxide with warm/hot water and
sieve it alone, several times. Letting it rest a few days and sieving again
may be worth trying, too.
Cindy Strnad
Earthen Vessels
Custer, SD
USA http://blackhills-info.com/a/cindys/menu.htm
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