Wagoner, Charles on tue 24 sep 02
sweet_srsu@YAHOO.COM asked for some Yellow Cone 10 glazes.
Here are three cone 10 yellow glazes that the Peeler's used.
As you can see Barium has raised it's ugly head again. I'll be curious to see if
RR has time to look these over.
Shaner Yellow Cone10
Zircopax 920
Spar 1960
Whiting 800
Talc 160
Red Iron 160
Bone Ash 400
Bentonite 70
Otto's Swedish Mat (Waxy Yellow) Cone 10 (Barium Toxic!)
Needs a lot of reduction
Feldspar 520
Whiting 90
Zinc Oxide 80
Barium Carb 210
Ball Clay 100
Flint 30
Rutile 20
Red Iron 42
Might add benotinite
(if shivering add NY SY)
St. John's Yellow Cone 10 (Barium Toxic!)
Feldspar 1152
Whiting 12.8
Dolomite 409.6
Talc 83.2
Ball Clay 246.4
Flint 128
Ochre 9.6
Barium Carb 640
Zircopax 384
Iron 76.8
Bentonite 30Cwag@abcs.com
cwagoner@nvc.k12.in.us
http://abcs.com/cwag
Ned Ludd on tue 24 sep 02
I had absolutely no luck with Shaner Yellow, ditto Shaner Red, firing
to cone ten in reduction. And yes, I used the firedown method,
soaking in oxidation at 2000 F. What came out was a bilious green,
ugly black where thick. Hideous!
I refired to cone 04 in an electric kiln, just to see what difference
- if any - it might make. I got a bleary mustardy yellow brown, but
the glaze surface was rendered unpleasantly rough matt, putting it
far out in the non-functional ballpark. This may have been due to its
very fast cooling in the Skutt.
I moved on to other, friendlier recipes - and ever since have cast a
very sceptical eye on so-called yellow cone ten glazes. Painted faces
on rotten flesh, so many of them!
best
Ned
>sweet_srsu@YAHOO.COM asked for some Yellow Cone 10 glazes.
>
>Here are three cone 10 yellow glazes that the Peeler's used.
>
>As you can see Barium has raised it's ugly head again. I'll be
>curious to see if
>RR has time to look these over.
>
>Shaner Yellow Cone10
>
>Zircopax 920
>Spar 1960
>Whiting 800
>Talc 160
>Red Iron 160
>Bone Ash 400
>Bentonite 70
Ron Roy on sat 28 sep 02
The 1st one (Shaner yellow) is way short of silica so it's not stable under
acidic conditions.
#2 (Otto's mat yellow) is way short of silica and it has over 20% barium in
it so it will leach Barium into food - fast - and change colour with some
foods. Expansion is very high so will craze - not shiver.
#3 (St Johns yellow) Again way short of silica - expansion high - over 20%
Barium ensures it will leach into food.
All three of these are not durable and it is right to label the last two as
toxic.
Gives me goose bumps to think how many functional pots these glazes have
been used on.
RR
>Here are three cone 10 yellow glazes that the Peeler's used.
>
>As you can see Barium has raised it's ugly head again. I'll be curious to
>see if
>RR has time to look these over.
>
>Shaner Yellow Cone10
>
>Zircopax 920
>Spar 1960
>Whiting 800
>Talc 160
>Red Iron 160
>Bone Ash 400
>Bentonite 70
>
>Otto's Swedish Mat (Waxy Yellow) Cone 10 (Barium Toxic!)
>Needs a lot of reduction
>
>Feldspar 520
>Whiting 90
>Zinc Oxide 80
>Barium Carb 210
>Ball Clay 100
>Flint 30
>Rutile 20
>Red Iron 42
>
>Might add benotinite
>(if shivering add NY SY)
>
>
>St. John's Yellow Cone 10 (Barium Toxic!)
>
>Feldspar 1152
>Whiting 12.8
>Dolomite 409.6
>Talc 83.2
>Ball Clay 246.4
>Flint 128
>Ochre 9.6
>Barium Carb 640
>Zircopax 384
>Iron 76.8
>Bentonite 30
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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