Glass Shear Mark?

Discussion in 'Pottery, Glass, and Porcelain' started by cxgirl, Sep 18, 2018.

  1. cxgirl

    cxgirl Well-Known Member

    Hi All,
    Is this mark on the bottom of the bowl considered a shear mark? Or maybe another term? Same mark just two different views:)
    any information appreciated
    thanks for looking
    DSCF6230.jpg DSCF6231.jpg DSCF6223.jpg
     
    cxgirl, Sep 18, 2018
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    Any Jewelry and Aquitaine like this.
  2. Cherryhill

    Cherryhill Well-Known Member

    A shear mark would be on the last part of the gather that left the the gathering rod. therefore not on the outside of the part, but on the inside. Shear mark, a chilled part of the gather would be on the inside of the bottom of a pressed piece. The mark in your piece could have been from a bubble that burst or from a bit of "dirt" that later fell out. Its not a flaw.
     
    Cherryhill, Sep 18, 2018
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    komokwa, judy, Any Jewelry and 4 others like this.
  3. cxgirl

    cxgirl Well-Known Member

    great information, thank-you Cherryhill:)
     
    cxgirl, Sep 18, 2018
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    judy and Aquitaine like this.
  4. Ownedbybear

    Ownedbybear Well-Known Member

    Known here as a glass pop.

    A bit more: internal shear marks are caused by poor annealing. I've seen paperweights shatter, literally from it.
     
    Ownedbybear, Sep 19, 2018
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    komokwa, judy and Any Jewelry like this.
  5. komokwa

    komokwa The Truth is out there...!

    with all the surrounding bubbles........yes..a bubble !
     
    komokwa, Sep 19, 2018
    #5 + Quote Reply
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