Kathy A. Cheriki on fri 14 mar 97
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Subject: mixing rio
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Date: Thu, 13 Mar 1997 13:21:43 -0500 (EST)
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Hi All,
I found a bag of rio in the classroom, and a student expressed a desire to
try it. I would also. However, I have never mixed up a batch. I think
all you do is add water, but is there any rule of thumb on proportions?
Thanks,
Kathy
Vince Pitelka on sun 16 mar 97
>I found a bag of rio in the classroom, and a student expressed a desire to
>try it. I would also. However, I have never mixed up a batch. I think
>all you do is add water, but is there any rule of thumb on proportions?
Kathy -
It depends on what you want to use the red iron oxide for. It is the most
widely used colorant in ceramics, and is responsible for the color of much
clay and rock. If you want to use it as a patina on textured bisqueware for
high-firing, just mix it with water to the consistency of whole-milk, paint
it on, and sponge it back off the high spots using plenty of water. It will
bond to the surface in firing. If you are low-firing in oxidation it will
not. As a patina on bare clay to accentuate texture or relief work at
low-fire temperatures, mix eight parts RIO to two parts Gerstley borate or
3134 frit, mixed to the same consistency, and apply as described above. You
can also apply a glaze over this in either case above, as long as the iron
is sponged off the high spots and broad areas. Otherwise iron does not work
very well for underglaze brushwork (the glaze will crawl). If you are
using it for overglaze brushwork, as with a Maiolica glaze, mix it six parts
iron to four parts Gerstley borate or 3134 frit.
- Vince
Vince Pitelka - vpitelka@DeKalb.net
Phone - home 615/597-5376, work 615/597-6801
Appalachian Center for Crafts
1560 Craft Center Drive, Smithville TN 37166
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