[Jewelry making - Article 00568] - Re: [Orchid] Ultrasonic rouge builds up

[Kevin]

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>          One of the biggest problems I come across when using the
>     ultrasonic is the amount of rouge powder that builds up in the
>     solution. I have tried filtering it out using fine mesh, without
>     any success. 

    Rouge is extremely fine, and therefore difficult to filter it all
    out. Fine filters are slower acting.  There's also the wax to
    consider.  I can think of two things you could do if you really must
    use an ultrasonic bath: 

    Pre-wash the pieces (may not be practical for your work....). 
    Options vary from washing by hand using detergent and a toothbrush,
    through to maybe using a steam-jet, if you're processing lots of
    pieces. 

    Or, put your pieces in a separate container of cleaning liquid which
    you then float in the ultrasonic bath.  Have several containers, so
    that you clean first in the most contaminated liquid, take the pieces
    out, rinse, then into the next cleanest liquid, and so on.  From time
    to time the dirtiest liquid is disposed of, and all other containers
    get "promoted" up one place, and you introduce a new container of
    clean liquid at the end of the row. 

    Some years ago I had professional contact with ultrasonic tank
    manufacturers who generally didn't approve of using floating
    containers.  But it is a practice widely adopted in horological
    circles, where you don't want to contaminate a tankful of expensive
    liquid with one dirty clock. 

Kevin  (NW England, UK)


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