[Jewelry making - Article 00232] - Re: [Orchid] Investment inside casting pieces

[John Donivan]

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>     but every now and then we still have this issue? Has anyone
>     encountered this problem, or have any suggestions? 

    There is much good advise on this. Probably the single biggest reason
    for your problem is tiny holes. Spalling, too, is a good culprit, if
    you don't mix the invenstment thoroughly. 

    Little holes, especially deep ones, as in the ones under stone
    setting, become tiny little pillars of investment after burnout. When
    the metal comes tearing through, it just knocks them down, and the
    investment gets mixed with the metal. If you look at the wax, and see
    any tiny little hole or space, realize that it's going to turn into a
    tiny sliver of investment later on. 

http://www.donivanandmaggiora.com


 
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