[Jewelry making - Article 00079] - Re: [Orchid] Quenching to Harden Ear Posts

[Janet Berg]

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    I would imagine the important factor is the RELATIVE temperatures of
    the object and the quenching solution. Normally we would want them
    to be close. That's why many usually wait til the piece cools down
    and others keep the acid hot. We usually do NOT throw red-hot
    objects into cold (room temp) pickle. Thus, immediate quenching in
    cold acid would be very different from immediate quenching in hot
    acid. The suddeness or slowness of the cooling determines the grain
    structure and consequently the hardness. 

Janet in Jerusalem

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