Lily Krakowski on sat 12 oct 02
Let me suggest you do a blend gradually reducing your GB and using Red Art
or another red earthenware clay instead. As these red clays mature before
c.6 you should get something interesting. Then start adding red iron oxide
again in a straight line blend, going up to something like 8% and you should
reach something nice. Manganese would be swamped in a lot of iron, although
you also could experiment with Blackbird /Barnard clay which contains some
manganese. A tidge of cobalt is nice in these brown glazes.
Also a tidge of rutile or ilmenite.
Do look up slip-glazes and you probably will find something pleasing.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Lily Krakowski on sun 13 oct 02
Someone asked about a brown glaze he planned to make out of a high gerstley
borate glaze. My response was essentially that a glaze like that would give
what to me are unsatisfactory weak-beer-bottle browns.
I suggested slip glazes--of which I am very fond, I admit, but added no
recipes. All my glazes are fired electrically. no idea what fuel burners or
reduction would do,
Mottled Black slip or glaze c.6 Adapted from Harry Fraser's book
Red Art Clay (a red earthenware) 62
Frit 3195 39
RED iron oxide 3
cobalt carb 2
manganese dioxide 4
This can be used as a slip, though I use it on leatherhard clay and fire as
glaze. 1 % rutile adds interest. This glaze can bed made runnier or stonier
with ease and rutile increased or decreased at will. Nice fun glaze.
Noah
Red Art 60
Neph Sy 20
Dolomite 10
Frit 3185 20
this is really a rich brownish black
On a lighter note:
Hannah
Red Art 78
Washed wood ash 15
talc 13
A golden caramel color.
These two glazes, named for one of my great nephews and one of my great
nieces, appear in my article Twice-Fired Glazes that was in PMI. (Can't
recall when) The second firing at c.04 turns these glazes red or reddish.
Lily Krakowski on tue 5 nov 02
Brown glazes are easy to make by taking a glaze a bit higher than your
intended firing temp, and replacing the ballclay or kaolin with common red
clay--such as Red Art. Then, if necessary you add some iron oxide and you
are a happy camper.
PMI published my Twice-Fired Glazes some time ago, but, for some reason I do
not find the copy right now. No idea which issue.... These were brown cone 6
glazes which, refired at 04 turned red or reddish--in the Irish
setter/sherry family of reds.
These glazes are adaptations of Hobart Cowles's twice fired Albany slip
glazes, and so we start with making an AS substitute.
For Albany slip glazes with added iron:
Red Art 580 or 7.5 cups
dolomite 80 or 1/2 + 1/4 c.
Whiting 25 or 1/3c. + 1 T
For Albany slip glazes without added iron
Red Art 80
Kentucky Ball Clay 20
Dolomite 10
wollastonite 10
To be truthful there is no big difference which mix you use in these
glazes...
Little Alex's Currant Jelly
Red Art Mix 55
Neph.Sy 18
Dololmite 9
Frit 3185 18
Red iron Ox 5
rich black, shiny, hints of purple at c.6 At 04 almost metallic, satiny,
rich brown, hints of dark red. Pretty much the same over light clay as dark
Cassie's Buckwheat Honey
Red Art Mix 57
Bone Ash 6
Nephsy 9
Frit 3185 9
frit 3134 9
Talc 9
Red iron ox. 7
At c. 6 dark "furry" brown with lots of blue. Golden on light clay. at c.04
red, smooth, slighly mottled, golden where pooled.
These adaptations of DeBoos glazes are very handsome. I make them by measure
and there are more such glazes, for you who care, in PMO Summer 1999.
DB3
Whiting: 2T minus 2t
Neph Sy 1/4 c + 1T
Ball Clay 2T
Red Art 2T
Fe203 1 t
caramel.
These work well applied to leather hard clay.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage.
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