[Jewelry making - Article 00078] - Re: [Orchid] Copper Etching - Edinburgh Etch

[John Burgess]

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    G'day Karla; I read the essay in the URL
    http://www.polymetaal.nl/beguin/mape/edinburgh_etch.htm And note
    that anhydrous citric acid is specified as an addition to ferric
    chloride etchant for copper, etc.. In MY OPINION  I see no reason why
    the citric acid should be anhydrous. There is a monohydrate of citric
    acid, and this is most probably the citric acid which is found in the
    supermarkets, and I don't think the fact that it may not be anhydrous
    would not matter all that much  After all you are going to add it to
    a water solution anyway.  It seems to me that the object of adding
    citric acid is to lower the pH and add a few more hydrogen ions. I
    would try a little and see.  Citric acid is very cheap. 

    To be honest, I wasn't keen on the style of that writer - it seemed a
    bit on the pompous side (academic?)   I suspect it was translated or
    written by a  German. 

-- 
Cheers for now,
John Burgess;   johnb AT ts.co.nz of Mapua, Nelson NZ


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