June Perry on thu 2 nov 00
James, did you add the colorants as percentage or as given in the recipe? If
you added them as a percentage, then you have 7% oxides in there, wherease,
if you add them as just gram additions to the base which add up to 400+grams,
you wind up in the neighborhood of about 1% iron, 1/2% chrome and 1/4%
cobalt. These amounts would give you a green rather than the black.
Regards,
June
Wade Blocker on thu 2 nov 00
Years ago I experimented with Binns glazes on porcelain. Therecipe you used
I changed to the following for some reason I no longer remember
Neph Syenite 50.8%
Whiting 21.3
Calcined Kaolin 20.1
Georgia kaolin 7.9
add Chrome oxide .6%
Cobalt oxide .3
Fe oxide 1.2
If I remember correctly I was not too happy with the result . I then used
Ball's Mg2 with Binns suggested color additions. One I particularly liked
was his Cool Green. Add to 300 grams of glaze:
Cu oxide 2.6%
Co oxide 0.33
Ni oxide 0.66
A mottled semi matt glaze.A feely.
His red brown was also attractive:to 300grams of glaze add:
Fe oxide 8
Chrome oxide 1
Zinc oxide 3
I fired the above glazes in an oxidation firing., on porcelain
Hope this helps, Mia in chilly ABQ
James L Bowen on thu 2 nov 00
In the book "The Potter's Craft" by C F Binns I
extracted this glaze recipe.
Stoneware Matt Glaze
Feldspar 167
Whiting 70
Calcined Kaolin 66
Raw Kaolin 26
for green to the glaze batch 329 parts add:
chrome oxide 2 parts
cobalt oxide 1 part
iron oxide 4 parts
What I got was matt black. I may have applied it
too thickly and will try
again in the next firing after thinning the
mix. Has anyone on the list had
experience with this glaze who can let me know
what to expect?
We fired to ^10 reduction. Sixteen hours to
temperature. Slow cool.
Thank you.
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