[Jewelry making - Article 00424] - Re: [Orchid] PMC Oxidizer: MaxBlack

[Linda Kaye-Moses/Evan Soldinger]

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Hello,

    A bit of misinformation appeared in another posting to Orchid Forum
    Re: liver of sulphur and Precious Metal Clay and I want to offer the
    correct information. LOS works beautifully with PMC and other metal
    clays (as well as with fine silver in general). I include patinating
    with LOS in all my workshops (check out my teaching schedule on
    <pmcguild.com>  General Classes listings). 

    After removing the metal from the kiln and cooling it, first, brass
    brush the metal with a drop of liquid dishwashing detergent, to
    brighten the surface. With PMC one should burnish the metal (via
    tumbling with steel shot... the easiest method) before patinating
    with LOS to prevent future gradual intensifying of the patina due to
    the low density of the sintered metal. At this point you might want
    to polish/finish the surface completely. Then go on to patina with
    LOS. 

    Use a slightly weaker LOS solution than one would use for sterling,
    using a warm solution and warming the metal itself under hot running
    water. Be sure to actively ventilate (a fan, not just an open
    window, that moves the air away from your nose) the area. 

    Dip the metal in the solution, rinse, dip, etc., alternating a dip
    in the solution with a rinse under hot running water until the
    desired patina coloration has been reached. This prevents an abrupt
    darkening of the metal and allows one to have some control over the
    patination process. 

    Wash off the metal when the desired color has been achieved. I
    occasionally will rinse the metal in my ultrasound with a few drops
    of soapy household ammonia for just a minute or two. 

    One can achieve, using this method, all the range of colors possible
    with LOS in addition to deep gray with Precious Metal Clay. After
    patinating, the metal can be wiped with a bit of olive oil and fine
    grade pumice on a 100% cotton rag to emphasize the raised areas, or
    may be brass brushed or tumbled again with a resulting all-over
    patinated surface. 

    Hope this helps to dispel any myths about using Liver of Sulphur to
    patinate metal clays. 

    For more information on using Precious Metal Clay, check out
    <pmcguild.com> and join the PMC Guild to receive the newsletter,
    Studio PMC, a useful and juicy periodical containing updates on
    techniques and  a gallery section in each issue. 

Linda Kaye-Moses

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