[Jewelry making - Article 00299] - Re: [Orchid] Video taping soldering

[marlin]

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    Doc, Glass workers have long used such a filter in their work. They
    wear special glasses made with neodymium and praseodymium oxides.
    These elements are very effective in filtering the bright
    yellow-orange flare of low pressure sodium - the sodium D line. Any
    one with a bit of science knowledge knows about the visible spectrum
    and how certain elements emit or absorb certain frequencies. These
    spectrum lines are a great help in identifying gems (using a
    spectroscope or chelsia filter) or on a TV crime show to identify
    evidence using a spectrometer. These glasses tint the view a bit on
    the purple-violet side, but are great for removing the sodium glare.

Marlin in Hot, Humid Denver.
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