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Polar Ice Porcelain with Body Stains - by Robert Barritz

Robert has done really valuable work in this research, what an amazing range of color! Surfaces are unpolished and unglazed. All are fired to cone 6. Browns are missing, they can be made using iron oxide. For blacks, Mason 6600 is also effective. The blues can be intense using lower percentages than shown here, as low as 2% can be effective. There is an optimal amount for each stain, beyond that, big increases in percentage bring less increase in color intensity. There is another reason to keep stain percentages to a minimum: To reduce the impact on body maturity (and firing shrinkage). Blues, for example, can significantly heighten the degree of vitrification, even melting the porcelain. If you plan to marble different colors, keeping stain percentage as low as possible is even more important, unless you can do fired shrinkage compatibility testing, for example, the EBCT test. Need to develop your own white porcelain? See the link below.

Buttons of fired porcelain of many colors

Related Pictures

Stained Plainsman Polar Ice Porcelain - With Polishing (no glaze)

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Green, red, black, blue, purple polished porcelain buttons

Fired to cone 6. These are not glazed. Polar Ice is very vitreous and very white, an ideal host for stains. However there is a caution: If a stain is refractory it can reduce the firing shrinkage of the porcelain considerably. On the other hand, some stains will flux bodies and do the opposite. That means if that if high and low shrinkage stained versions of Polar Ice are laminated or marbled the firing can create a tension-time-bomb that either exits the kiln cracked or cracks down the road. Of course, a polished surface would not be suitable for food or drink surfaces if the porcelain is being stained by an inclusion pigment containing cadmium or other known hazard metal. This work is courtesy of Robert Barritz.

Timeline to make a cone 6 red porcealin test

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Red burning porcelain test being prepared

This is L4588 red burning porcelain. It is an idea with a strong possibility of working. I got the idea after coffee break and was rolling and pressing specimens right after lunch. Here is the timeline.
10.30 am: I got the idea to make this, created a record in my Insight-live account, code-numbered it and printed the recipe.
10.35 am: I started weighing it out.
10.40 am: I blender mixed it really well to remove all agglomerates.
10.45 am: I poured it onto my plaster bat.
12.30 pm: It had stiffened to the perfect consistency to roll a couple of SHAB test bars and press and stamp some porcelain theme rocks.
Next day: In the kiln. Next day: Incredible red porcelain at cone 6.
Much of the reason not to be intimidated by mixing tests like this is having all the tools and materials close at hand and a good record-keeping system. And making sure to enter results, notes and pictures as tests are completed. And linking this to related tests (I am also working on a pink and a blue).

Links

Materials Spectrum 2276 Yellow Stain
Materials Mason 6464 Yellow Stain
Materials Mason 6485 Yellow Stain
Materials Mason 6537 Grey Stain
Materials Mason 6386 Blue Stain
Materials Mason 6600 Black Stain
A cobalt-containing stain useful in bodies, engobes and glazes at a wide range of temperatures.
Materials Stain 6121
Materials Stain 6201
Materials Stain 6219
Materials Stain 6234
Materials Stain 6200
Materials Mason 6255 Stain
Materials Mason 6266 Stain
Materials Frit VO 6200
Materials Frit VO 6255
Materials Mason 6363 Stain
Materials Mason 6304 Violet Chrome Tin
An encapsulated purple stain. Purple is very difficult in ceramic glazes and this stain delivers incredible color in glossy glazes.
Materials Mason 6308 Stain
Materials Mason 6306 Stain
Materials Mason 6368 Copen Blue Stain
Materials Stain 6388
Materials Mason 6027 Stain
Materials Mason 6021 Red Stain
An encapsulated red stain, it has proven better than any other red we have ever tried for glazes. And it works in bodies.
Glossary Ceramic Stain
Ceramic stains are manufactured powders. They are used as an alternative to employing metal oxide powders and have many advantages.

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