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| Tips, Techniques, and Questions -- Technical questions or tips |
2013-06-06, 12:59pm
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Senior Member
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Join Date: Oct 08, 2010
Posts: 855
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What kind of crack is this?
This is a bead I made about 1 year ago. I noticed a small crack, that doesn't go all the way through. Is this compatibility?
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2013-06-06, 12:59pm
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Senior Member
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Join Date: Oct 08, 2010
Posts: 855
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I think this was EDP, Dirty Martini, & ivory rolled in raku.
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2013-06-06, 1:14pm
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Senior Moment
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Join Date: Jun 16, 2012
Location: New Yawk
Posts: 4,161
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It's pretty straight and right on the mandrel line. I'm going to guess it was a heat issue, that just becoming more apparent.
Alli
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2013-06-06, 1:24pm
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Dichro Addict
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Join Date: Sep 04, 2005
Location: Dallas, Texas
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I agree with Alli.
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Lenora
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2013-06-06, 1:26pm
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Join Date: Aug 02, 2007
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What Ali said, thermal shock. It will break apart before to long.
Bob
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2013-06-06, 2:14pm
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Senior Member
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Join Date: Oct 08, 2010
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I am glad I kept it. LOL Thanks you guys!
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2013-06-06, 3:14pm
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...
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Join Date: Apr 03, 2006
Location: Nor-Cal Coast
Posts: 892
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Yep, the heat on squished beads leaves the area around the mandrel quickly because the mandrel acts like a heatsink . Before going into the kiln that area should have a good soak of heat so this doesn't happen. Sorry it happened though 
If it was compatibility it would look more like spider webs
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2013-06-06, 7:46pm
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hyperT
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Join Date: Jan 31, 2013
Location: San Antonio, Texas
Posts: 582
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Technically 10 minutes soaking time at the annealing temperature per millimeter thickness.
Sometimes it won't show for a very long time, then a sudden change in temperature or even altitude can cause it. It may or may not crack any further since the stress is released during the cracking. Corning annealed the MT. Palomar telescope lens for 18 months. That was the second one the first one was cooled to rapidly and they lost it.
There is also the possibility that the piece was dropped on a hard surface or struck sharply. I think you should seek the wisdom of a soothsayer for this one?
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2013-06-07, 5:39pm
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Slogan Challenged...
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Join Date: Mar 21, 2009
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or melt it into a cab, that is way too pretty to lose.
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