Paul Lewing on tue 9 may 06
on 5/9/06 1:04 PM, Rikki Going at rikkig@MAXNET.CO.NZ wrote:
> I glazed a prebisqued terra
> cotta colored tile first with each color alone and then with combinations
> of the three oxides. I fired them to 04. Results: all of them came out
> red! The yellow oxide was the nicest. A dark wine red, yummy. I got a
> bit carried away with my calculations and added 8% as I was mixing it into
> a white base. I may play a bit more with smaller percentage. But, in the
> meantime, my questions to everyone out in pottersland are: What is this
> stuff? Has anyone used it? Has anyone heard of it? Why do all three
> colors come out almost identically in color?
They're probably all variations of iron bearing clays in which the iron is
in the form of ocher or yellow iron oxide. The percentage of iron and other
impurities accounts for the differences in raw color. When you fire them
alone, the only thing with a significant amount of color to it that's left
is the iron, which is obviously converting to red iron.
Oh, one last comment. I
> also tried some in a clear base glaze and those just came out colorless.
Yellow iron is the weakest form of iron oxide (black iron is the strongest).
You probably just didn't put in enough to make a difference. I'd bet that
if you added about 1/3 this stuff to 2/3 glaze you'd see a color. It might
not melt, though. Try a line blend.
Paul Lewing
Rikki Going on tue 9 may 06
Recently I was browsing a new maga hardware store in my area. It's
similar to a Home Depot or Lowes. In the cement area I came across jars
of oxides used to color cement. Being naturally curious, I bought three
little jars for tests. They are labelled: yellow oxide, red oxide and
marigold oxide. No other info about ingredients was offered on the
labels. I mixed them into a white glaze. I glazed a prebisqued terra
cotta colored tile first with each color alone and then with combinations
of the three oxides. I fired them to 04. Results: all of them came out
red! The yellow oxide was the nicest. A dark wine red, yummy. I got a
bit carried away with my calculations and added 8% as I was mixing it into
a white base. I may play a bit more with smaller percentage. But, in the
meantime, my questions to everyone out in pottersland are: What is this
stuff? Has anyone used it? Has anyone heard of it? Why do all three
colors come out almost identically in color? Oh, one last comment. I
also tried some in a clear base glaze and those just came out colorless.
Any insights will be appreciated: Thanks. Rikki at rikkig@maxnet.co.nz
Warren Heintz on tue 9 may 06
I played around a little with the stuff. Had some black or charcoal as they were calling it,from Home Depot. I had it primarily for some cement castings I had done. I put it on a low fire,04,piece that I was testing different things on,and low and behold it turned a dark red. I figured that the black may have had an iron oxide,but who knows, there were no ingredients listed. I stayed out of the room with the kiln in it as much as possible during the firing. Haven't tried any other colors. Warren
Rikki Going wrote: Recently I was browsing a new maga hardware store in my area. It's
similar to a Home Depot or Lowes. In the cement area I came across jars
of oxides used to color cement. Being naturally curious, I bought three
little jars for tests. They are labelled: yellow oxide, red oxide and
marigold oxide. No other info about ingredients was offered on the
labels. I mixed them into a white glaze. I glazed a prebisqued terra
cotta colored tile first with each color alone and then with combinations
of the three oxides. I fired them to 04. Results: all of them came out
red! The yellow oxide was the nicest. A dark wine red, yummy. I got a
bit carried away with my calculations and added 8% as I was mixing it into
a white base. I may play a bit more with smaller percentage. But, in the
meantime, my questions to everyone out in pottersland are: What is this
stuff? Has anyone used it? Has anyone heard of it? Why do all three
colors come out almost identically in color? Oh, one last comment. I
also tried some in a clear base glaze and those just came out colorless.
Any insights will be appreciated: Thanks. Rikki at rikkig@maxnet.co.nz
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iglasgo on wed 10 may 06
Rikki-
You can find out some of what's in these mystery powders by going to
the company website and looking at the MSDS. For instance, Scofield's
Lithochrome Chemstain "Black" contains manganese chloride, sodium
bichromate, and hydrochloric acid. It is a corrosive product and its
cautions include advice to wear a respirator, goggles, gloves, etc.
In my experience many of these products also contain powdered Portland
cement and lime. Also, the pigments are usually water-soluable.
Happy experimenting-
-Ivy, concrete geek
--- In clayart@yahoogroups.com, Rikki Going wrote:
>
> Recently I was browsing a new maga hardware store in my area. It's
> similar to a Home Depot or Lowes. In the cement area I came across jars
> of oxides used to color cement. Being naturally curious, I bought three
> little jars for tests. They are labelled: yellow oxide, red oxide and
> marigold oxide. No other info about ingredients was offered on the
> labels. I mixed them into a white glaze. I glazed a prebisqued terra
> cotta colored tile first with each color alone and then with
combinations
> of the three oxides. I fired them to 04. Results: all of them
came out
> red! The yellow oxide was the nicest. A dark wine red, yummy. I got a
> bit carried away with my calculations and added 8% as I was mixing
it into
> a white base. I may play a bit more with smaller percentage. But,
in the
> meantime, my questions to everyone out in pottersland are: What is this
> stuff? Has anyone used it? Has anyone heard of it? Why do all three
> colors come out almost identically in color? Oh, one last comment. I
> also tried some in a clear base glaze and those just came out colorless.
> Any insights will be appreciated: Thanks. Rikki at rikkig@...
>
>
___________________________________________________________________________=
___
> Send postings to clayart@...
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@...
>
claybair on wed 10 may 06
Hi Ivy,
I have been thinking about doing a
concrete totem but don't want it to weigh a
ton. Since you said you are a concrete geek...
I thought I'd ask you if you have a favored
hypertufa recipe.... and if you do are you willing
to answer a bunch of questions regarding technique for
making it.
I did take a workshop on the subject 3 years ago
but may not have retained all the info I need for this project.
whatever your answer I extend my thanks.
Gayle Bair
Bainbridge Island, WA
Tucson, AZ
http://claybair.com
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG]On Behalf Of iglasgo
Sent: Wednesday, May 10, 2006 10:27 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: cement coloring oxides
Rikki-
You can find out some of what's in these mystery powders by going to
the company website and looking at the MSDS. For instance, Scofield's
Lithochrome Chemstain "Black" contains manganese chloride, sodium
bichromate, and hydrochloric acid. It is a corrosive product and its
cautions include advice to wear a respirator, goggles, gloves, etc.
In my experience many of these products also contain powdered Portland
cement and lime. Also, the pigments are usually water-soluable.
Happy experimenting-
-Ivy, concrete geek
--- In clayart@yahoogroups.com, Rikki Going wrote:
>
> Recently I was browsing a new maga hardware store in my area. It's
> similar to a Home Depot or Lowes. In the cement area I came across jars
> of oxides used to color cement. Being naturally curious, I bought three
> little jars for tests. They are labelled: yellow oxide, red oxide and
> marigold oxide. No other info about ingredients was offered on the
> labels. I mixed them into a white glaze. I glazed a prebisqued terra
> cotta colored tile first with each color alone and then with
combinations
> of the three oxides. I fired them to 04. Results: all of them
came out
> red! The yellow oxide was the nicest. A dark wine red, yummy. I got a
> bit carried away with my calculations and added 8% as I was mixing
it into
> a white base. I may play a bit more with smaller percentage. But,
in the
> meantime, my questions to everyone out in pottersland are: What is this
> stuff? Has anyone used it? Has anyone heard of it? Why do all three
> colors come out almost identically in color? Oh, one last comment. I
> also tried some in a clear base glaze and those just came out colorless.
> Any insights will be appreciated: Thanks. Rikki at rikkig@...
>
>
____________________________________________________________________________
__
> Send postings to clayart@...
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@...
>
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
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