[Jewelry making - Article 00504] - Re: [Orchid] Etching sterling silver

[Peter W . Rowe]

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>             Is it possible to achieve a good etch in say 30 min. to an
>     hour? 
>
>        Not with ferric nitrate. For this quick of an etch you need to
>     use nitric acid. The ferrics are used by those wishing fewer health
>     hazards, but they etch quite a bit more slowly. 

    they also etch quite a bit more evenly, with significantly less
    undercutting. And you can speed it up a whole lot with agitation, 
    and even more with a low voltage so it's an electroetch.   Spray
    etchers using ferric nitrate are fast enough to fit the described
    time, though that's not simple technology any more. 

Peter

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