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Silvering/mirroring glass, any ideas?

Discussion in 'Electronic Repair' started by N_Cook, Oct 27, 2008.

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  1. N_Cook

    N_Cook Guest

    To silver part of a standard mercury discharge lamp for use as a video
    projector bulb, presumably less screen illumination , but 15 foot diagonal
    not necessary.
    No evacuation chamber available.
    Ideas so far, aluminium cooking foil , cut to a ribbon, and wound around;
    ground-off front and back of a photo-flood light bulb and fixed over as a
    collar; any other ideas?
  2. Yukio YANO

    Yukio YANO Guest

    Google Brashear Process
    It's an old Amateur Telescope Maker's recipe

    I used it 50 years ago

    You need Silver Nitrate
    Ammonium Hydroxide
    A supply of de-ionized water

    at that time (1950-60) every good sized town had a shop that Re-silvered
    mirrors. They used a two-component Sprayer to flood the glass surface
    with a Silver-ammonium complex and co-reacted it with a Glucose solution
    to reduce the silver solution to metallic silver, which plated out on
    the glass. It's messy, really requires a fume hood, waste disposal
    problems, can be an explosion hazard. I did it in a kitchen sink as a
    teen-ager! Silver cost about $.50 an ounce then.

    Through my employers, I graduated to Evacuation Chambers and Sputter
    Coaters and learned to coat with aluminum, tungsten, platinum, gold, carbon.

    I think ~10-25 pound sterling would get you the necessary chemicals and
    glass-ware plus a bag of Kitty-litter for waste disposal, less if you
    are good at scrounging. EG. you could buy "Fine Silver" from a Lapidary
    Shop, Glucose as a food suppliment, Potassium Nitrate as fertilizer,
    Sulfuric Acid from a Car Battery shop.

    Yukio YANO
    Saskatoon , Saskatchewan Canada
  3. N_Cook

    N_Cook Guest

    Ta, an amateur astronomer's page now only on
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