Dennis Davis on sun 26 apr 98
A friend is having a problem with the copper carbonate in an Oribe
green glaze. The copper carbonate seems to not disperse evenly
throughout the glaze. The glaze comes out a dark (blackish) looking
green than previously fired batches. Also, there are dark greenish
specks in the glaze. One suspicion is that the copper carbonate is not
as finely ground as it once was. We plan to check with the supplier but
are wondering whether anyone else has had this problem?
Dennis in Stafford, VA
DIANA PANCIOLI, ASSOC. PROF. on mon 27 apr 98
Yes, I have experienced variation in copper carbonate; some was
particularly course once, but that time it worked in my favor. I didn't
grind or screen it, which might be the solutions to course copper.
Diana
EMU
On Sun, 26 Apr 1998, Dennis Davis wrote:
> ----------------------------Original message----------------------------
> A friend is having a problem with the copper carbonate in an Oribe
> green glaze. The copper carbonate seems to not disperse evenly
> throughout the glaze. The glaze comes out a dark (blackish) looking
> green than previously fired batches. Also, there are dark greenish
> specks in the glaze. One suspicion is that the copper carbonate is not
> as finely ground as it once was. We plan to check with the supplier but
> are wondering whether anyone else has had this problem?
>
> Dennis in Stafford, VA
>
Stephen Mills on tue 28 apr 98
In the past we have had problems with copper carb because the makers had
changed their method of producing it. I'm not knowlegable about the
process used but it seemed to coat the powder with a substance that
resisted water and made its combining with glaze a near impossibility.
The cure was apparently a very small amount of washing up liquid in the
mix which de-greased the copper and allowed it to combine.
Steve
Bath
UK
In message , Dennis Davis writes
>----------------------------Original message----------------------------
>A friend is having a problem with the copper carbonate in an Oribe
>green glaze. The copper carbonate seems to not disperse evenly
>throughout the glaze. The glaze comes out a dark (blackish) looking
>green than previously fired batches. Also, there are dark greenish
>specks in the glaze. One suspicion is that the copper carbonate is not
>as finely ground as it once was. We plan to check with the supplier but
>are wondering whether anyone else has had this problem?
>
>Dennis in Stafford, VA
>
--
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
| |
|
