[Jewelry making - Article 01273] - Re: [Orchid] Galvanized kitchen countertops

[Marty]

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Hello  again,

    Nothing wrong with galvanized countertops except that they are
    neither the most durable noreasiest to maintain,nor good for knives
    etc.  The danger from zinc (which is the surface coating) comes
    mainly from when it is heated to a point where it vaporizes. Even
    then it is not chemically poisonous, as far as I know, but the zinc
    oxide crystals form into very thin, very pointy crystals - I recall
    they are elongated three-sided pyramidal shapes which emanate in
    threes or fours from a centre point.  If you have trouble
    visualizing that, look up "caltrop" in the dictionary and you'll
    probably see  picture.  Anyway, these microscopic murderers get into
    one's lungs when zinc smoke is breathed and do in there what
    caltrops do to horses' feet. Bad news.   So be careful braing or
    silver soldering - it's the white smoke that has the zinc crystals. 

Marty in Victoria

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