[Jewelry making - Article 00125] - Re: [Orchid] Inconsistent Etching Results

[Silververkstan d&b]

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Karen,

    Noel does explicitly state that his tip is for "for ferric, not
    nitric acid!" As for the airbubbles in the liquid my past experiences
    led me to understand that the air was distributed by a tube with
    many orifices evenly distributed along the bottom of the tank. A
    submersible heater can also be used. 

    Actually, the described setup is commersially available. It is used
    for etching copper for printed circuitboards. The choise of etchant
    decides which temperature to use. Most acidbaths generates their own
    heat and doesn't need heating although many years ago I used a
    sulfuric acid bath to etch copper and that was heated to 100 degrees
    to be active, but is was very even in etching (it contained 25
    gallons liquid), important for me since my requirements were
    measured in 0.02 mm. 

    If you feel your etchant gets spent too fast, get a larger bath. And
    preferably deeper. Etching in a pan or shallow bowl isn't the best
    way although i surely works for many. 

kindly
michaela

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