[Jewelry making - Article 00043] - Re: [Orchid] Inconsistent Etching Results

[Linda Castellani]

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Hi Kerri -

    I've been trying to find a respirator that works with nitric acid.
    What are you using? 

    I have a question about this: 

>     Temperature is definitely a factor. If you drop a little scrap
>     silver in there for at least a few minutes before you start
>     etching it will get the acid bath warmed up for you. You can take
>     the silver scrap out or leave it in until you are done using the
>     bath, but the longer you leave it in, the quicker your acid bath
>     will weaken. This should definitely give you more consistent
>     results. 

    How does putting scrap silver into the acid change the temperature,
    and how does weakening the acid give more consistent results? Both
    of those things sound counter-intuitive to me. 

Thanks!
Linda

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