Richard Mahaffey on thu 17 jun 04
Being an old fart my memory is slow these days. I thought something we
learned in grad school might be of help to others out there.
GUIDELINE
In a Limestone Clear Glaze iron by percent addition makes the following
colors when fired in reduction.
.25% to 2% Iron Light Celadon
2+% to 4% Iron Dark Celadon
4+% to 6% Iron Root beer brown to tobacco spit brown (doesn't that
sound lovely?)
6+% to 8% Iron red-brown to black
8+% to 10% Iron black breaking to red
15% Iron Black bubbly mess
These are just a guideline in the above class of glazes. YMMV (your
milage may vary)
Also remember that Iron acts somewhat like a flux in reduction while it
acts like refractory in oxidation. (Cobalt tends to the opposite
characteristics) Again a guideline YMMV.
If anyone wants the base glaze that we use let me know and I will post
it or email it to those who want it (it is based on Leach's "cone 8
limestone" clear in "A Potter's Book" ).
Rick Mahaffey
Joe Sanger on fri 18 jun 04
Richard Mahaffey
I would love to have you send me the bsae glaze
limestone clear glaze so I can tru your formulas
Thanks very much
Joe Sanger
jsanger@pacbell.net
--- Richard Mahaffey wrote:
> Being an old fart my memory is slow these days. I
> thought something we
> learned in grad school might be of help to others
> out there.
> GUIDELINE
> In a Limestone Clear Glaze iron by percent addition
> makes the following
> colors when fired in reduction.
>
> ..25% to 2% Iron Light Celadon
> 2+% to 4% Iron Dark Celadon
> 4+% to 6% Iron Root beer brown to tobacco spit
> brown (doesn't that
> sound lovely?)
> 6+% to 8% Iron red-brown to black
> 8+% to 10% Iron black breaking to red
> 15% Iron Black bubbly mess
>
> These are just a guideline in the above class of
> glazes. YMMV (your
> milage may vary)
> Also remember that Iron acts somewhat like a flux in
> reduction while it
> acts like refractory in oxidation. (Cobalt tends to
> the opposite
> characteristics) Again a guideline YMMV.
>
> If anyone wants the base glaze that we use let me
> know and I will post
> it or email it to those who want it (it is based on
> Leach's "cone 8
> limestone" clear in "A Potter's Book" ).
>
> Rick Mahaffey
>
>
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Ivor and Olive Lewis on fri 18 jun 04
Dear Richard Mahaffey,
I know I would get some support on this topic. Thanks for coming to
the party.
I agree, the work done by the Coleman's is most attractive. But there
is no mention as to the nature of the glazes or very much else about
any of the works featured on that site.
One thing that surprises me is that although a lot is often said about
the information given by Hamer and Hamer, no one seems to have thought
of quoting their opinion. I wonder what the new edition says and
shows?
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
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