[Jewelry making - Article 00252] - Re: [Orchid] The halogens

[Eileen Procter]

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    Oh John!  You've forgotten Fluorine: a pale yellow, diatomic gas.
    corrosive, reacts vigorously with most oxidisable substances at room
    temperature, frequently with ignition. 

    Incidently, patinas using chlorine to colour copper and iron are the
    bane of many a conservator.  The chlorine reacts with moisture and
    oxygen from the air to form hydrochloric acid which in turn attacks
    (very aggressively) the metal.  The chlorine is not used up in the
    reaction (like a catalyst) and can continue to attack the metal
    until there is none left.  The only way to stop the process is to
    remove the chlorides entirely (soaking and changing the bathwater
    frequently), remove access to moisture or oxygen.  This type of
    corrosion is colloquially called "Bronze disease". 

Eileen

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