Karen Shapiro on wed 21 jul 99
Hi all,
I find myself working on a cobalt blue glaze for raku and have gotten a
beautiful deep blue using cobalt carb with my base raku glaze (70 gerstley
borate/30 neph.sye.) but am trying to get more depth and a bit of flash into
it.
Any suggestions?
thanks so much,
Karen in Sonoma
ababy sharon on thu 22 jul 99
Try to add about 10% zircopax for "cooling" the cobalt and a little copper
Oxide 1-2% for nice spots in the reduction
Ababi
----- Original Message -----
From: Karen Shapiro
To:
Sent: Wednesday, July 21, 1999 07:52
Subject: Raku cobalt blue glaze
> ----------------------------Original message----------------------------
> Hi all,
>
> I find myself working on a cobalt blue glaze for raku and have gotten a
> beautiful deep blue using cobalt carb with my base raku glaze (70 gerstley
> borate/30 neph.sye.) but am trying to get more depth and a bit of flash
into
> it.
> Any suggestions?
> thanks so much,
> Karen in Sonoma
>
Wendy Hampton on thu 22 jul 99
I would add some copper to get flashing
Wendy
Stephen Mills on fri 23 jul 99
Dear Karen
My blue Raku glaze consists of:
85 parts by weight High Alkaline Fritt
15 ................China Clay (Kaolin)
1.25 ..............Cobalt Carbonate
1 .................Copper Carbonate
This glaze starts out a fairly virulent BLUE, but with time (like a
wine) it gets better, developing more and more coppery lights, mauves,
and purples until (again like a wine) after about 18 months - 2 years in
the bucket it gets crabby and stops performing completely. I usually
make it about a month before I want to use it.
I have no idea why it behaves like this, I just use it and enjoy it!
Steve
Bath
UK
In message , Karen Shapiro writes
>----------------------------Original message----------------------------
>Hi all,
>
>I find myself working on a cobalt blue glaze for raku and have gotten a
>beautiful deep blue using cobalt carb with my base raku glaze (70 gerstley
>borate/30 neph.sye.) but am trying to get more depth and a bit of flash into
>it.
>Any suggestions?
>thanks so much,
>Karen in Sonoma
>
--
Steve Mills
Bath
UK
home e-mail: stevemills@mudslinger.demon.co.uk
work e-mail: stevemills@bathpotters.demon.co.uk
own website: http://www.mudslinger.demon.co.uk
BPS website: http://www.bathpotters.demon.co.uk
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