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Tips, Techniques, and Questions -- Technical questions or tips |
2009-02-21, 8:03pm
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Senior Member
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Join Date: Sep 19, 2006
Location: Troy, Ohio
Posts: 105
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A question about coal
Hi everyone, I think I've read on here that if you add a piece of coal to your kiln, the colors will stay as they were when you put them in. My question: do you have to worry about the coal catching on fire? Can you use charcoal? I want to try it, but don't want any surprises! Thanks. Jill
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2009-02-21, 10:20pm
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Yeah me!
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Join Date: Jun 24, 2008
Location: indianapolis indiana
Posts: 1,382
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Don't use regular bbq charcoal use the kind you get for fish tank filters at the pet store. No it will not catch fire, and it only takes a little bit.
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Kristina
"...he who does not know and does not know that he does not know is a fool, avoid him." -Confucius
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2009-02-22, 8:18am
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Senior Member
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Join Date: Aug 01, 2005
Posts: 2,159
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I'm assuming that you mean charcoal. In that case Krinstina is correct. If you mean real coal - don't do it. You'll get a lot of very nasty smoke at the very least and quite probably fire as well when the smoke ignites.
Robert
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2009-02-22, 12:38pm
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Lover of all things color
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Join Date: Nov 25, 2007
Location: Lawrenceville, GA
Posts: 1,791
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No coal. Activated charcoal is what I use. I have a little glass ashtray that I keep in my kiln and I fill it every time I light up the torch. It tends to even out the chemistry in my kiln. I'm using a fusing kiln and have to open the lid to put in each bead which introduces additional oxygen. The charcoal eats up the extra oxygen.
Hope this helps.
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2009-02-22, 6:51pm
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Senior Member
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Join Date: Sep 19, 2006
Location: Troy, Ohio
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Thank you all. The information I get here is invaluable! Jill
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2009-02-22, 8:23pm
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Senior Member
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Join Date: Sep 12, 2007
Location: Haliburton
Posts: 81
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Okay this is interesting to me but I have some doubts.
Can anyone give an example of the differences between the color saturation with no charcoal and after they placed charcoal?
I have a fusing kiln as well and when I check the colors of the rods to my beads, there is no difference in the colors, to my eye or otherwise.
J
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2009-02-23, 3:50pm
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Lover of all things color
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Join Date: Nov 25, 2007
Location: Lawrenceville, GA
Posts: 1,791
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I doubt that the charcoal is necessary for the bead annealers, the little door that opens doesn't change the chemistry of the inside of the kiln. I use a fusing kiln and having to open the door was reintroducing a lot of oxygen back into the kiln and I was loosing any of the silver color that I had gotten by reducing. Anyplace that the bead touched the fiber blanket and was protected still had the silver reactions but the rest had gone dull. The activated charcoal consumes the oxygen to create the correct chemistry. I just got into the habit of using it each time just in case I used any of the silver glasses. Most of the time now I encase them to protect them. I figure it can't hurt and thus far hasn't.
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2009-02-23, 4:58pm
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Senior Member
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Join Date: Sep 17, 2005
Posts: 903
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Quote:
Originally Posted by JBeads
Okay this is interesting to me but I have some doubts.
Can anyone give an example of the differences between the color saturation with no charcoal and after they placed charcoal?
I have a fusing kiln as well and when I check the colors of the rods to my beads, there is no difference in the colors, to my eye or otherwise.
J
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The charcoal is used to keep reduction on the surface which would otherwise be re-oxidized in some kiln environments. It doesn't affect color saturation.
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