Diane Woloshyn on wed 18 feb 98
Am looking for a white matt glaze with tiny black specks ^5-6 oxidation. The
following glaze is a nice white matt and the addition of 1% Illmenite gives me
tiny gold to brown specks. Would substituting Black Iron Oxide give me th
black flecks? In what percentage? Or any other ideas? Have to buy some Black
Iron Oxide or would have already tried this. TIA
White Satin Matt
Nepheline syenite 35
Dolomite 14
Whiting 8
Zinc Oxide 7
China Clay 20
Flint 16
Add Ilmenite 1 For gold to brown specks
Diane, Florida Bird Lady
Cindy on thu 19 feb 98
Diane,
Just one idea, and maybe not the one you're looking for, but . . . I use
clay with manganese. This always bleeds through my white glazes with tiny
black specks. I don't use a white matte, but it does work with my satin
white. For satin white, I just use Tony's 5x5 with 7% Zircopax.
Cindy Strnad
Earthen Vessels
Custer, SD
USA http://blackhills-info.com/a/cindys/menu.htm
David Hendley on thu 19 feb 98
Hey, Diane, the Bird Lady,
Start collecting rust scale!
If you have some old rusty metal around, scrape off
the flaking rust into a jar.
If you keep on the lookout, you'll notice likely rust
sources lots of places.
Put it through a 30-mesh screen, so you don't have
any big chunks, and add it to your white glaze.
Commercial black iron oxide is too finely processed to
give you specks.
David Hendley
Maydelle, Texas
At 09:07 AM 2/18/98 EST, you wrote:
>----------------------------Original message----------------------------
>Am looking for a white matt glaze with tiny black specks ^5-6 oxidation. The
>following glaze is a nice white matt and the addition of 1% Illmenite
gives me
>tiny gold to brown specks. Would substituting Black Iron Oxide give me th
>black flecks? In what percentage? Or any other ideas? Have to buy some Black
>Iron Oxide or would have already tried this. TIA
>
>White Satin Matt
>
>Nepheline syenite 35
>Dolomite 14
>Whiting 8
>Zinc Oxide 7
>China Clay 20
>Flint 16
>
>Add Ilmenite 1 For gold to brown specks
>
>
>Diane, Florida Bird Lady
>
>
Lili Krakowski on fri 20 feb 98
AND PLEASE: When you go around collecting rust; a steel brush will help a
lot; but when you do this thrilling work, wear good safety goggles and
work gloves. Some "scale" is really sharp and a speck of it can do
terrific eye damage. An alternate suggestion: At a hardware/paint supply
store buy steelwool (it comes in grades from 000 to I think #3.) Let it
rust--and voila. I would start with something like #2. Experiment. In
fact you can start experimenting with that old Brillo pad that fell behind
the counter, and rusted there! It will give you an indication of
thickness you want.
Pricey but it is eassier, unless you really live down the road from
a junk yard. (Who doesn't?)
Lili Krakowski
Ron Roy on fri 20 feb 98
Hi Diane,
The best way I know how to get the black specks is with granular manganese
- !5 will be too much though. Try ti find some that has different sized
granuals - then you can separate them by sieving them and using the sizes
you like best. Don't breath any dust while sieving - there might be some
present - the larger paticles are not a problem cause they can't be
airborne. You will also have to keep the glaze well stirred cause the
"specks" will settle out fast.
Axner has some - but will it be small enough for you?
You might also try some granular iron - like rust - and break it it up to
the sizes you want - I have heard of "blacksmith scale" being used for
specks.
Now you have me thinking - maybe a combination of the two - where will it
all end?
Like most matte glazes - this one is short of silica and therefore not durable.
>----------------------------Original message----------------------------
>Am looking for a white matt glaze with tiny black specks ^5-6 oxidation. The
>following glaze is a nice white matt and the addition of 1% Illmenite gives me
>tiny gold to brown specks. Would substituting Black Iron Oxide give me th
>black flecks? In what percentage? Or any other ideas? Have to buy some Black
>Iron Oxide or would have already tried this. TIA
>
>White Satin Matt
>
>Nepheline syenite 35
>Dolomite 14
>Whiting 8
>Zinc Oxide 7
>China Clay 20
>Flint 16
>
>Add Ilmenite 1 For gold to brown specks
>
>
>Diane, Florida Bird Lady
Ron Roy
93 Pegasus trail
Scarborough Otario
Canada M1G 3N8
Phone: 416-439-2621
Fax: 416-438-7849
Web page: Home page http://digitalfire.com/education/people/ronroy.htm
Janet H Walker on sun 22 feb 98
Funny this topic should come up just now. I'm just ready to go
public with a process that I was trying out because i like the
specking you get in manganese specked bodies. But i haven't liked
the manganese bodies that I tried (got bloating).
So I tried adding manganese specks to a white slip. My supplier had
something called 60-80 mesh manganese (I assume this is finer than 60
mesh and coarser than 80 mesh). I added about 0.5% of this to a white
slip and painted the slip on a slab. (Porcelain and red clay so far,
leatherhard so far, this is what I had around.) Clear, white, and
cream glazes so far all look pretty good on this. I'm getting specking
that is just as nice as what I got before with the specked clays. The
range of speck sizes is not as broad but the effect is good. I like
the fact that this minimizes the potential amount of manganese dioxide
just lying around.
I think for someone starting out that you'd want to try between 0.5%
and 1.0% depending on how dense you like your speckles. The trick will
be the get properly milled manganese dioxide, with specks not dust.
The specks look black with a clear cover glaze, otherwise they look
more dark brown, pretty much like those in a manganese specked clay body.
Have fun with this,
Jan Walker
Cambridge MA USA
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