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Most Active In:: Clay and Glaze Technical (63 posts)
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Posts I've Made

In Topic: 06 Majolica base glaze

Posted 23 May 2013

I have a recipe that is for firing at cone 04, stroke n' coats will lose none of their color at ^04. This recipe can be brushed to dipped, try to keep the application thin though.

Linda Arbuckle Majolica:

frit 3124 65.8

F-4 feldspar 17.2

EPK 10.8

neph sy 6.2

100.0

+ tin 4

+ zircopax 9

+ bentonite 2
In Topic: Questions about using wax resist

Posted 22 May 2013

The turpentine is not necessary. Beeswax, paraffin, beeswax + paraffin it all works. wax in the kiln will not cause adverse effects on non- waxed pots. The reason for this is that wax completely burns out at around 800 degrees, before the glaze begins to develop at all. However, too much wax resist fired in an electric kiln is very bad for the kiln, but unless you are dipping and filling every pot with wax resist you don't have to worry about anything. Also, you do not need to scrape the wax off.

Good Luck!

Darrel
In Topic: What aspect of clay work gives you the most pleasure?|May 21, 2013

Posted 21 May 2013

Brushing rutile wash decoration on the surface of leather hard porcelain pots is the best.
In Topic: Oldie/Newbie

Posted 21 May 2013

Look up a potter named Sumi Von Dassow, she is one of the most brilliant potters in the country and she knows almost everything there is to know about pit firing. She has a book and DVD available on ceramic arts daily.

Good Luck!

Darrel
In Topic: making petrified wood

Posted 17 May 2013

jrgpots, on 14 May 2013 - 11:10 AM, said:
MichaelP, on 14 May 2013 - 10:06 AM, said:
jrgpots, on 13 May 2013 - 11:19 PM, said:
How about injecting Argon through the ramping and then turning it down during transition and hold time? Would that help in carbon trapping or allow reduction as some oxygen returns to the kiln. Some of the carbon would be burned to act with other reducing agents?

I'd think that loss of carbon, especially on or close to the surface, is a realtively quick process.So as long as you have oxygen around and the tempearture is sufficient, decarburization is almost inevitable. Naturally, if you shorten exposure time to oxygen, you may, potentially, keep more carbon deep inside, but will you achieve your goal then?

How about this... Place a piece inside of a saggar. horse hair or other combustables on the pottery. Low fire it in an Argon environment. Continue the Argon until about 600 degree on the cooling cycle, then stop the Argon. The result, horse hair pottery in an electric kiln?? OK, Ok I realize my dream is fading fast. WHy would anyone go to that much effort when the original method of horse hair pottery works so well?

If you really want to do horse hair in an electric kiln, place pots on top shelf, heat to cone 019 remove with tongs and place on firebrick. Then drape the hair on the pots. The whole process takes about 4 hours including cooling.