Polish glass carrier?

Discussion in 'Darkroom Developing and Printing' started by jjs, Mar 23, 2005.

  1. jjs

    jjs Guest

    It's come to this. I need to polish an old glass carrier (Leitz Focomat IIa)
    to get rid of some fine 'something' that's spotted it. This is my only
    spare. I was thinking of using Maguire's fine Plexiglas polish. No?
     
    jjs, Mar 23, 2005
    #1
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  2. Why plexi polish? I would think a commerical Vinegar based glass cleaner
    or even Vodka would work as well or better.

    It is after all glass and not plexi, the cloth you use is probably more
    important, I would use soft cotton "Non lint producing" rather than
    any paper or paper towel product. You could probably use lens cleaner
    fluid for that matter.
     
    Gregory Blank, Mar 23, 2005
    #2
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  3. jjs

    dan.c.quinn Guest

    Bon Ami. Clean hands only. It has a talc like grit
    and should be safe. Bon Ami, since 1886. Dan
     
    dan.c.quinn, Mar 23, 2005
    #3
  4. I'd say not. Abrasive on glass? Not what you want to use, unless it's
    absolutely unavoidable. And then you're basically into resurfacing the glass,
    which is not trivial.

    I second the earlier motion for vinegar (or even vodka). Hey, not only is
    vodka OK for vegetarians (it contains no meat), it has no abrasives!
     
    David Nebenzahl, Mar 23, 2005
    #4
  5. jjs

    dan.c.quinn Guest

    Only a suggestion that Bon Ami and it's talc like material.
    Talc registers a one on mohs scale of hardness while glass rates
    a five. I think it will be safe to use but I'd proceed with
    caution. Dan
     
    dan.c.quinn, Mar 24, 2005
    #5
  6. jjs

    Scott Coutts Guest

    Glass is pretty resiliant, so any cleaning products should be fine. I'd
    use dish washing detergent and a cloth, then wash in water. If it doesnt
    come off, then go buy some metho from the hardware shop. It will just
    evaporate off or you can also wash that off with water. If you have
    enough spare vodka for cleaning, I suggest drinking it instead :)
     
    Scott Coutts, Mar 24, 2005
    #6
  7. Have a look at the surface using a magnifier and a light
    source you can shine at various angles. See if its scratched
    or if the marks are just on the surface. Its also possible
    the glass has been coated with something, perhaps to
    eliminate Newton's rings.
    If its something on the surface, and you are sure its not
    a coating try any of the "streak-free" glass cleaners first.
    If this doesn't work, try 99% Isopropyl alcohol (available
    at many drugstores). If that doesn't work try Acetone.
    Acetone is a standard cleaner in optical assembly. Some
    petrolium based materials may come off with Naptha. Naptha
    is available as lighter fluid, like Ronsonol.
    If the surface is scratched you may not be able to polish
    it out with any readily available material. Bon Ami won't do
    it. Its possible the Plexiglas polish might work but
    Plexiglas is much softer than glass plus it flows a little
    when polishing tending to help fill in cracks. The problem
    is that any abrasive capable of removing the scratches will
    also turn the holder into ground glass.
    As a last resort you may be able to get optical glass
    flats from Edmund Optical or some similar company. Optical
    glass is clear when viewed sideways. If the holder is green
    when so viewed thin window glass will do the trick at a much
    lower price.
     
    Richard Knoppow, Mar 24, 2005
    #7
  8. jjs

    dan.c.quinn Guest

    That's true. I suggest Jeweler's rouge. The finest
    of abrasives are used to give the finish to optics.
    That should put an end to any qualms in using a
    correct abrasive to clean glass. Dan
     
    dan.c.quinn, Mar 24, 2005
    #8
  9. jjs

    Bob AZ Guest

    Be careful with this. The glass maybe AntiNewton and thus the finish
    you have maybe be deliberate.

    Bob AZ
     
    Bob AZ, Mar 25, 2005
    #9
  10. jjs

    Phuels Guest

    Thanks to all who responded. One side is AN glass - the one with the spots.
    :( I'll try the mild acetic route and if it doesn't work, Gin or Vodka to
    make the problem seem less daunting.
     
    Phuels, Mar 25, 2005
    #10
  11. Dishwashing detergent is a better choice. If the coating
    is plastic of some sort this won't hurt it. The problem is
    if the coating has been damaged cleaning it won't help.
    Anti-newton-ring glass is available from a number of
    sources, for instance try Bob Watson, who responded earlier
    in this thread. Bob repairs enlargers of all sorts and has
    parts for many.
     
    Richard Knoppow, Mar 26, 2005
    #11
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