[Jewelry making - Article 00710] - [Orchid] Edinburgh Etch with ferric chloride

[Mona Clee]

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    In the article by Gail Nelson on the Edinburgh Etch: 

    "Better - Safer Etching Metal Salt Etching, Resists and Resist
    Removal" 

    http://www.ganoksin.com/borisat/nenam/safe-etching.htm 

    the recipe calls for a 4/5 saturated solution of ferric chloride
    (40%) plus a 1/5 citric acid solution (3/4 hot tap water to 1/4
    anhydrous citric acid). Then it gives an example: 

    16 oz. ferric chloride
    3 oz hot tap water
    1 oz citric acid powder

    I get how to put together the citric acid part, but Bryant Labs is
    out of powdered ferric chloride right now, and all I have is the
    premixed liquid ferric chloride from Radio Shack.  Does anyone know
    if it's a 4/5 saturated solution -- and what does the "40%" mean? 
    There's no information on the label.  Can I just add the citric acid
    and hot water directly to the liquid ferric chloride? 

    If I was going to mix the solution using powdered ferric chloride,
    surely I would add even more water to the above example? 

Mona

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