[Jewelry making - Article 00249] - Re: [Orchid] What is the value of an ultrasonic?

[Alastair]

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    Warning - don't put hands or fingers in the ultrasonic! The blood in
    the veins and arteries of inserted body parts gets aerated and forms
    tiny clots which can circulate and lodge in dangerous places such as
    the brain. If this is a myth please debunk it. I believe it is true
    because ultrasonics work by causing tiny bubbles to expand and
    contract, and by so doing lifting the dirt off. We have all heard
    what bubbles in the blood can do - the bends, clots caused by air in
    injections. 

    That said, they are marvellous cleaners - sometimes too good, they
    will clean out the green resin in "enhanced" emeralds, the "blue"
    from turquoise, and if given enough time the black off oxidised
    silver. They are great for quickly dislodging thick layers of flux. 

    Get the most powerful you can afford (my non-technical definition:
    the more the liquid jumps about, the more powerful it is), and the
    biggest size tank you can afford within reason (they can be 5
    gollons or more for industrial applications). They are useful for so
    many other cleaning jobs: dunk your spectacles for a few seconds and
    they come out looking new; handpiece, carburettor....... OK that's
    enough, they are perfect for jewellery!
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