Karen Shapiro on mon 9 aug 99
Hi Clayarters,
I had asked for a deep cobalt raku glaze and thank those who replied. I
ended up fiddling around with many combinations and came up with the
following which I thought I'd share. It's DEEP dark cobalt blue with
incredible copper flashes. Note: it is very runny (and expensive!), but
worth it.
Killer Cobalt Raku
75 gerstley bor.
25 neph.sye.
3 copper carb.
6 cobalt carb.
5 barium carb.
Karen in Sonoma
Burtt on tue 10 aug 99
Hi Karen,
Thanks for the cobalt raku glaze. Sounds like one I want to try. I
made up a batch today and will try it in the next couple of days. Can
you give me a couple of other pointers on it? Did you apply thick or
thin? And did you get the most contrast and flashing with heavy or light
reduction? Do you always reduce with the same process, or does it vary
from glaze to glaze?
Thanks so much.
Steve Burtt
Ocean Springs, Mississippi
Karen Shapiro wrote:
>
> ----------------------------Original message----------------------------
> Hi Clayarters,
>
> I had asked for a deep cobalt raku glaze and thank those who replied. I
> ended up fiddling around with many combinations and came up with the
> following which I thought I'd share. It's DEEP dark cobalt blue with
> incredible copper flashes. Note: it is very runny (and expensive!), but
> worth it.
>
> Killer Cobalt Raku
>
> 75 gerstley bor.
> 25 neph.sye.
> 3 copper carb.
> 6 cobalt carb.
> 5 barium carb.
>
> Karen in Sonoma
Karen Shapiro on fri 22 oct 99
Howdy all,
A number of you have written me directly asking for the recipe for this
glaze, so I thought I'd repost it for anyone else who missed it.
"Killer Cobalt"
gerstley bor. 75
neph. sye. 25
copper carb. 3
cobalt carb. 6
barium carb. 5
very runny -- fluxes like crazy. Heavy reduction gives heavy copper flashing.
Karen in Sonoma
Ron Roy on sun 24 oct 99
I don't know what temp this is supposed to be fired but it is going to
probably leach badly - I'd have it tested before I put it where it could be
in contact with food.
RR
>----------------------------Original message----------------------------
>Howdy all,
>
>A number of you have written me directly asking for the recipe for this
>glaze, so I thought I'd repost it for anyone else who missed it.
>
>"Killer Cobalt"
>
>gerstley bor. 75
>neph. sye. 25
>copper carb. 3
>cobalt carb. 6
>barium carb. 5
>
>very runny -- fluxes like crazy. Heavy reduction gives heavy copper flashing.
>
>Karen in Sonoma
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Karen Shapiro on mon 25 oct 99
Hi RR,
Just for edification, the last time I posted this (before receiving so many
requests to repost), I explained that it's a RAKU glaze -- for sculptural
uses only.
But thanks anyway,
Karen in Sonoma
terryh on mon 25 oct 99
i never thought anybody uses RAKU pottery for food, or even for water (for
live flowers). i mean the western raku. especially when the glaze is called a
killer (grin) (even after washing off all carbon sooth, and ignoring all
cracks).
terry
----------------------------Original message----------------------------
I don't know what temp this is supposed to be fired but it is going to
probably leach badly - I'd have it tested before I put it where it could be
in contact with food.
RR
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