[Jewelry making - Article 00905] - Re: [Orchid] Metal hardness and melting point

[Dan Woodard]

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    My knowledge, which might be patchy, tells me there's too many
    confounding variables here. What's considered the metal's "natural
    hardness"? Cooling by oil/water quenching versus cooling with
    ambient/flowing air of various temps and wind speeds from liquidus to
    solidus affects hardness. Give us torches and kilns and we can modify
    hardnesses all day long. Aren't metal hardnesses measured in Rockwell
    and/or other units? Brasses/bronzes vary by hundreds of degrees in
    melt point, depending on alloy mix. 

    Maybe concentrating on fine versus sterling silver and the effect of
    alloying on melt point would be a more manageable hypothetical. 

    With metals prices rallying, a piece on acid testing would be fun.
    That was my sci-fair project that never was. 

    Maybe just giving different brasses the comparison? 

Dan


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