Lili Krakowski on fri 20 apr 07
As to black glazes. In my opinion the richest and nicest are those based on
red clays.
If I may suggest a glaze from that Pottery Making Illustrated article
Summer 2000 (Volume 3, Number 3, pages 28 and 29--in case you want your
public library to get you a photocopy)
Little Alex's Currant Jelly
Albany Slip Substitute I 55
Dolomite 9
Neph Sy 18
Frit 3185 18
Add: Red Iron Oxide 5%
At c. 6 Rich black, shiny, with some hints of purple Same on light clay.
Refired to c. 04 Almost metallic, satiny, rich brown, with hints of dark
rich red. No streaking.
Again: Albany Slip Substitute I
RedArt clay 84.7
Dolomite 11.7
Whiting 3.6
I use this for glazes that call for extra iron, anyway.
Albany Slip Substitute II
RedArt 66.7
Kentucky Ball Clay 16.7
Dolomite 8.3
Wollastonite 38.3
These mixes are wet mixed, screened, dried, and stored for later use.
Alisa tested some of these Twice Fired Glazes in a digital - kiln and was
very satisfied with results. I just fire them.
They can be applied to leather hard clay, once fired if one wishes, and they
are interesting over slips. Last: I expect other red clays besides RedArt
to work as well. And I imagine a tidge of cobalt would not hurt the above
glaze.
FYI: Little Alex turned 12 a couple of weeks ago. The other great-nieces
and nephews also are growing apace. I need to
add two more glazes, as Clyde and Eli deserve them too.
ABOUT OLD STAINS:
Old stains can contain lead, antimony, cadmium, and I do not know what else
banned from the studio today. For instance some of the most lovely yellow
stains were lead antimony mixes. My humble suggestion is...the toxic waste
(or whatever it is called) dump.
Lili Krakowski
Be of good courage
Ivor and Olive Lewis on sat 21 apr 07
Dear Lili Krakowski ,
As I recall, I referred to product that would be used beneath a layer of =
glaze. It has Co, Cr, Fe, Mn, Ni in its composition. Much to expensive =
to use to colour bulk glazes. But it did give such a wonderful intense =
neutral black.
No Pb, no As, no Cd, no V, no Sb.
Yes, do dispose of obsolete materials in a responsible way.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
| |
|
