[Jewelry making - Article 00469] - [Orchid] Proper process for age hardening 18K yellow

[Ted L. Chapanian]

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    I have made an a few 18K rings that need to be age-hardened. Some
    quick background: I bought gold nuggets, purified them in the chem
    lab, and mixed an 18K alloy. I did the lost wax casting process in
    my garage with hand fabricated equipment because I couldn't afford to
    buy the real stuff. 

    My question is: Now that I have cast my rings, how do I age harden
    them? 

    My alloy is 18K yellow (Au 75%, Ag 16%, Cu 9%). I have searched all
    over Ganoksin and haven't found clear instructions for this type of
    alloy. I need temps and durations for both annealing and
    age-hardening. 

    So far, I have found: Anneal at 600C and quench, Age harden at 300C
    for 2 hours. Can anybody please verify this or provide me with
    correct information. 

Thank you,
Ted Chapanian
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