[Jewelry making - Article 00306] - Re: [Orchid] Sparex No 2 101

[John Donivan]

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>     take that pseudo-medical half-truth with a large grain of kosher
>     salt- 

    This thread's pretty incredible, I think. Ya take your Sparex or
    similar, Ya take your water, Ya mix em together........ Nice thing
    is, ever since the days of Rutherford and Lavoisier, we can have
    science, or chemistry fact: 

    If there's any such thing as pulmonary arrest as a reaction to
    sulfuric acid, it's news to me - a link to that would be
    helpful-------- Now drowning to death and gasping due to pulmonary
    edema, which is certainly an effect that is known, that's different. 

    Dilute sulfuric acid does not dissolve copper, period. Hot
    concentrated acid does, but that's another story. If it did, you
    would shortly not have a vessel, now would you? 

    Since the designed purpose of a jeweler's pickle solution is to
    remove boron glass from soldering, and sodium bisulfate is 100%
    effective at that,we can say that it is, indeed, 100% efffective. I
    also have used sulfuric acid pickle, and it is quicker and more
    efficient, it's true, but the danger of mixing and storing acid is
    far outweighed by that, which is why the industry lives on Sparex. 

    Sulfuric acid does not form sulfides, and never will without a chem
    lab. Sulfuric acid (H2SO4) forms sulfates, sulfuous acid (H2SO3)
    forms sulfites, and sulfur or it's compounds, such as hydrogen
    sulfide forms sulfides. 

    Will all this in mind, if you have sulfuric acid in a copper vessel
    and it dissolved the vessel, you will shortly have a solution of
    copper sulphate, and it will be brilliant ultramarine blue, quite
    poisonous, by the way, and completely useless as the acid will be
    depleted. 

    It could quite well be that there is some bi-metallic action
    happening with pickle in a copper pot, but since pickle in a glass
    pot is 100% effective at it's designed job, I'm not sure that it
    matters unless there's some certain circumstance where it applies. 

    I am sorry if this is blunt, but please check facts before posting.
    Misinformation about chemistry is dangerous and quite easily
    researched before hand. There is much chemical lore in our trade,
    but it's quite simple to check the facts, if one is inclined to. 

http://www.donivanandmaggiora.com
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