[Jewelry making - Article 00228] - Re: [Orchid] Investment inside casting pieces

[andy cooperman]

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    I have seen air bubbles in the wax cause this as well, if the air
    bubbles are close enough to the surface of the wax that a relatively
    thin wall of wax is left between the bubble wall and the outside wall
    of the model. During investing the air in the bubble expands and
    ruptures the wax model wall, allowing investment to creep in. 

    It depends on how efficient your vacuum is and how close the bubble
    is to the exterior of the casting.


 
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