[Jewelry making - Article 00396] - Re: [Orchid] Safer pickles

[Bruce Holmgrain]

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    I hate to be the only one around to pooh pooh a safety precaution. I
    cut and pasted the following from the MSDS on Sulfuric acid. 

    "Avoid breathing mist or vapors. The International Agency for
    Research for Cancer ("IARC") Monographs on the Evaluation of
    Carcinogen risk to Humans at 106 (Vol. 54, 1992) lists strong
    inorganic acid mists containing sulfuric acid as a suspected
    carcinogen. The National Toxicology Program ("NTP") lists strong
    inorganic acid mists containing sulfuric acid as a known carcinogen
    in the 9th Report on Carcinogens (9th RoC, May 15, 2000). This
    applies to inorganic acid mists containing sulfuric acid and does
    not apply to sulfuric acid or sulfuric acid solutions." 

    Note that the IARC calls "strong inorganic acid mists containing
    sulfuric acid" a "suspected carcinogen" and the NTP refers to "strong
    inorganic acid mists containing sulfuric acid as a known carcinogen."
    Please note the words "strong" and "suspected". Further reading
    suggests the NTP seems to have relied on epidemiological studies to
    have arrived at it's conclusion. How many other substances were
    involved in the cancers enumerated in the studies? I haven't found
    any animal studies that have substantiated any of this. 

    I, too, would really like to hear what John Burgess has to say. 

    I will keep on using my sodium bisulfate. I'll keep quenching my
    work, too. 

    When I was an apprentice, we used sulfuric acid for pickle. That
    produced some strong mists. Sounds crazy, but we used the acid to
    clean wounds as well. 

Bruce D. Holmgrain
JA Certified Master Bench Jeweler
http://www.goldwerx.com


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