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| Tips, Techniques, and Questions -- Technical questions or tips |
2012-08-16, 2:53pm
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The Harbinger of Cuteness
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Join Date: Dec 11, 2007
Location: Los Osos, San Luis Obispo County, California
Posts: 1,465
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Polariscope question
If a 104 encased bead is going to crack because the core (like opals) doesn't like being encased, will that show up as stress in a polariscope? Or is it only thermal stress that shows up in a polariscope?
Reason I ask: cracks and bead breaks can take hours/days/weeks/months/years to happen, but the polariscope can generally tell me if a bead is stressed out as soon as I take it out of the kiln. SO, I'd like to be able to check for stress on a well-annealed, cored bead before I sell the bead, instead of setting the bead aside before listing it to wait for it to crack.
Does that make any sense? 
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Aimee Moisa
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#M-191
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2012-08-16, 5:23pm
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Senior Member
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Join Date: Aug 01, 2005
Posts: 2,159
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You would have to have a pretty thick encasement to be able to see the stress lines. You really need transmitted light to see them clearly. In my experience you can pretty much count on encased opalino or alabastro cracking if you encase it. there are always exceptions, but I just don't bother.
Robert
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Robert Simmons
(Former) Director for Bead Donations
Beads of Courage, Inc.
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2012-08-16, 5:28pm
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The Harbinger of Cuteness
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Join Date: Dec 11, 2007
Location: Los Osos, San Luis Obispo County, California
Posts: 1,465
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Thanks Robert!
Quote:
Originally Posted by RSimmons
You would have to have a pretty thick encasement to be able to see the stress lines. You really need transmitted light to see them clearly. In my experience you can pretty much count on encased opalino or alabastro cracking if you encase it. there are always exceptions, but I just don't bother.
Robert
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Aimee Moisa
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#M-191
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2012-08-18, 11:51am
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Glass Hive Kiln Tech.
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Join Date: Jun 23, 2007
Location: Toledo, OR
Posts: 907
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I do have a trick for using opalinos with encasement. If the core of the bead is made with the the clear, then do an encasing layer of opal, then the clear encasement, you will have far less stress than just the base of opal alone. There is a term for this kind of trick, but it escapes my Saturday brain.
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