[Jewelry making - Article 00963] - Re: [Orchid] Etching Vs. Using a Jewelers Saw

[Silververkstan d&b]

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Hi Noel

    I liked your etching instruction. Easy to understand and to follow.
    There's no magic nor danger as long as one knows what one is doing
    and aware of the fact that there are chemicals involved. 

    This for Kerri: Always avoid breathing vapor although it is not
    nitric acid coming out of the bath that needs to be filtered but
    nitrous gases (and not healthy). 

    BTW. When I get nitric acid on my skin it turns to yellow spots
    until it (the damaged skin) wears off. 

    I've done etching on and off for the past 30 years, commercially,
    industrially, small scale and for home use (as a teenager). I have
    always used acids, hydrochloric, sulphuric, phosphoric, acetic and
    nitric, sometimes spiced with a little hydrogenperoxide, all
    depending on the material. The only caveat is hydrofluoric acid to
    etch glass, you'll have to be careful and use some protection, I've
    never done it though. 

    Imagetransfer can be done in many ways, you use the cheap and modern
    way. It can also be done with silkscreen printing an acid resistant
    ink or lightsensitive emulsions or laminates that are exposed with a
    photographic film/pattern and processed prior to etching. The liquid
    resists seem to be scarce nowdays. These give better (thicker)
    protection to the acid meaning less repairwork. The way you cover
    both sides with a resist pattern is THE way to success. My greatest
    problem is to estimate the potential undercut, it can be a problem
    in heavy gauge. People involved in model railways sometimes make
    their own wagons, etched all through in thin brass plate after
    detailed designs. 

    My experience with the transfer tecnique does make me ask one
    question? When you say acetate I suppose you mean polyester based
    overhead foil. Most laser printers have a very hot fuser unit and
    acetate wouldn't survive. Also that if you have any means to control
    the print/copy I would imagine a heavier toner deposit would be
    preferable. 

michaela

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