Ellie Blair on sat 19 apr 03
It was recommended to me to use Spanish red iron oxide in my crystalline =
glazes. I have found that the glazes turn out matte and speckled or =
mottled. I do get some crystal formation but small. I have tried this =
in several different firing schedules but it always turns out the same. =
Should I just stick to the red iron oxide?
Ellie B.
Craig Martell on sun 20 apr 03
Hi:
Red Iron Oxide is refractory in an oxidation fire. Black iron is more
fusible and, if I remember correctly, is considered an amphoteric with
regard to oxidation. You might give the Black Fe a whirl and see if it's a
better source for what you want.
regards, Craig Martell Hopewell, Oregon
Ron Roy on mon 21 apr 03
Hi Craig,
I have used both and there is some difference in colour but they say the
black gets red during the oxidation part of the firing - worth a try
though.
RR
>Red Iron Oxide is refractory in an oxidation fire. Black iron is more
>fusible and, if I remember correctly, is considered an amphoteric with
>regard to oxidation. You might give the Black Fe a whirl and see if it's a
>better source for what you want.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Fabienne Micheline Cassman on mon 21 apr 03
I tried SRIO once and it was muddy; I didn't bother with it any further since there is a more successful array of colorants available. Everywhere I read iron was not mentioned as a colorant or it was not recommended for _macro_ crystalline glazes which I assume is what you are doing. Even clay bodies with iron in them are not recommended. I suspect it is a combination of glaze/clay interaction as well as using a darker "canvas" doesn't help showing vibrant colors.
Fabienne
---------- Original Message ----------------------------------
>From: Ellie Blair
>It was recommended to me to use Spanish red iron oxide in my crystalline glazes. I have found that the glazes turn out matte and speckled or mottled. I do get some crystal formation but small. I have tried this in several different firing schedules but it always turns out the same. Should I just stick to the red iron oxide?
>Ellie B.
--
Fabienne Cassman http://www.milkywayceramics.com/
WARNING: I cannot be held responsible for the above
because my cats have apparently learned to type.
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Fara Shimbo on tue 22 apr 03
Hi, Fabienne and Ellie,
I use RIO in my crytalline glazes all the time and have
great success with it, either alone or in combination with other
colorants. One hint for using it that I do have is that you'll
need to sieve the glaze thoroughly before using it, or you'll
get iron spots in the glaze (although you may like these, I
don't know.) I use a 200 mesh Talisman sieve and get really
nice results that way, crystals that are sometimes several
centimeters in diameter. Never tried Spanish RIO though.
Fa
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Fara Shimbo, Master Crystallière, Certified Public Nuisance
Shimbo Pottery, Box 41, Hygiene, Colorado, USA 80533
www.shimbopottery.com ^^^ www.crystalline-ceramics.info
Silly Science Fiction: http://klysadel.net
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