[Jewelry making - Article 00500] - Re: [Orchid] 2 Hours Casting

[Fred Sias]

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    My thanks to Eddie Bell for clarifying the requirements for large
    flask burnout. My experience is mostly with small flasks. I see I had
    some incorrect ideas regarding the change in investment strength
    between the start and end of burnout. 

    I wish I had all of the Santa Fe Symposium papers you mentioned but
    the university interlibrary loan folks got unhappy when I kept
    ordering reprints of different articles. I couldn't afford to buy all
    19 volumes. 

    I would like to know if disappearance of the grey and a change to a
    "chalky appearence" of the pouring cup is a "sufficient" indication
    of adequate burnout even in the large flasks. Otherwise is there any
    clear indication of sufficient burnout other than inserting a
    thermocouple or allowing more than enough time? 

Fred

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