Bob Cyr on sun 22 mar 98
Dear Good People of ClayArt,
I have both Spanish Red and Iron Oxide Red on hand and may have made a
mixup in the last batch of glaze that was mixed. Both materials are stored
in jars and I may have made the selection based on color rather than on
reading the label. I will retrace my steps and resolve that issue, but it
raised the question: what are the constituents of Spanish Red?
I checked both Hamer (1975 edition) and Fournier and could find no listing
for Spanish Red.
If there is anyone out there that knows, I would appreciate hearing from you.
Thanks,
Bob
Reaching out from Townsend Hill, Springville, NY, USA
Sarah Barnes on sun 22 mar 98
Hi, I think Spanish red is just a more pure form of Red iron Oxide, so it
should not be too much of a problem.
Sarah
On Sun, 22 Mar 1998, Bob Cyr wrote:
> ----------------------------Original message----------------------------
> Dear Good People of ClayArt,
>
> I have both Spanish Red and Iron Oxide Red on hand and may have made a
> mixup in the last batch of glaze that was mixed. Both materials are stored
> in jars and I may have made the selection based on color rather than on
> reading the label. I will retrace my steps and resolve that issue, but it
> raised the question: what are the constituents of Spanish Red?
>
> I checked both Hamer (1975 edition) and Fournier and could find no listing
> for Spanish Red.
>
>
> If there is anyone out there that knows, I would appreciate hearing from you.
>
> Thanks,
>
> Bob
>
> Reaching out from Townsend Hill, Springville, NY, USA
>
Tom Buck on mon 23 mar 98
Bob C: My Chem Dictionary says:
"Iron oxide, red: (burnt sienna, caput mortuum, chemical red,
crocus martis, Indian red, jeweler's rouge, Mars red, metallic red,
mineral red, natural red oxide, Persian Gulf oxide, purple oxide, raddle,
red bole, red earth, red iron oxide, red ocher, red oxide, Spanish oxide,
Turkey red). Pigments composed mainly of Iron (III) oxide (ferric oxide),
Fe2O3. See also Ferric Oxide for data on the pure substance.
"Uses: Marine paints, metal primers, polishing compounds, pigment
in rubber & plastic products, theatrical rouge & grease paints."
FYI, Spanish red (iron oxide red) is still produced in Spain by
leaching a massive crude deposit with bacteria suspended in water. The mix
is sprayed on the ore, and the run-off collected and chemically treated to
recover high-purity iron oxide. This long-worked deposit just keeps
producing Spanish Red because it has very low costs.
Tom Buck ) tel: 905-389-2339
& snailmail: 373 East 43rd St. Hamilton ON L8T 3E1 Canada
(westend Lake Ontario, province of Ontario, Canada).
JLHclay on tue 24 mar 98
Here in the desert we write on our plastic jars, & add a paper note to the
inside, masking tape dries up & flakes off.
| |
|
