pigment for porcelain

Iron oxide. A bucket of rusty nails.... I'm only half way joking here. Iron oxide is easy to come by. If you don't want to go through your local ceramic supply business, there are many online that you can order from but if you only want a small amount I would recommend finding a near by public ceramics studio (check colleges/schools) and asking them if they can sell you a pound.

Try Guerra Paint & Pigment

510 E 13th St, New York, 10009 (212) 529-0628

They have a very large stock of dry pigments!

At 1200F, it's not true porcelain (clay). That matures at about 2200F. It doesn't use titanium oxide for white, either - it's naturally white from its main ingredient kaolin. Are you talking about porcelain enamel, such as is used for coating gold crowns? If that's the case, you wouldn't simply add a pigment; you'd need to fire it with some brownish enamel mixed in, then regrind it before use. But various shades of off-white enamel are available to those in the dental industry - why reinvent the wheel?

Andrew Werby

I assume you mean porcelain enamel. What are you coating? copper?

Standard body or glaze pigments from a hobby store will work. There are a large number of pigments available and you can add combinations until you achieve the desired results. - for tinting - start with a small fraction of a percent. You need to mix the pigment in well.

You will need to experiment to achieve the desired results.

Iron oxide is a bit pink rather than brown. Maybe iron oxide & another pigment or two.

Hul

Thanks, I'll take a look.

Hul

Yes, porcelain enamel. It will coat steel. Local hobby stores would be a simple solution - thanks.

Hul

if your working to experiment, use 6 table spoons of milk of magnisia, with 1/4 teaspoon of borax and 4 table spoons of gum arabic into a cup of water... this will fire stain porceline a bare off white tan colour, much like old bone, test this, i get very unpredictable results using non-standard chemicals..

pepto bismol is a good bismuth (nrown-purple) source and some antiacid tablers make for good opaquing / whitener sources (a couple of brands are nothing but pressed kaolin and flavoring)

A GOOD article on non standard glaze and pigments sources...

1200F sounds like a pretty low temperature for steel. What system are you using? What type of base coat are you using? Is your steel pickled or are you using a liberty base coat?

I've been out of the PE field for a while - I was just curious... Gregg

I think you meant to say calcium carbonate, not kaolin.

I wouldn't expect kaolin to have any antacid activity. (Nor any particular whitening ability). The standard antacid tablets I am familar with are calcium carbonate (Tums, etc). It's the carbonate that provides the antacid effect, by reacting with the acid to form carbon dioxide (like those vinegar and baking soda demonstrations from grade school).

Potters know calcium carbonate as whiting. But don't try eating whiting as an antacid. Pharmaceutical grade calcium carbonate is low in lead, which is a contaminant in most other calcium carbonate sources. Last I heard, most of the antacid grade came from one particular quarry in Mexico.

Best regards,

Bob Masta D A Q A R T A Data AcQuisition And Real-Time Analysis

Scope, Spectrum, Spectrogram, Signal Generator Science with your sound card!

not to be picky, heres a report for the medical use of kaolin for the treatmetn of colic

Kaolin and Morphine This is a popular remedy because of its reputation, however it has now been vastly improved upon by medicines like Loperamide. It is available in liquid and tablet form. The kaolin absorbs anything in the bowel that may be the cause of the diarrhoea while the morphine relaxes the bowel muscles and slows down bowelw movements. If you use this product remember to keep drinking plenty of fluids. Also, if you use the mixture shake the bottle well.

from:

Gregg