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what is shinier? gold or silver

Discussion in 'Gold Silver (All things Metal)' started by 97guns, Apr 17, 2013.



  1. 97guns

    97guns Gold Member Gold Chaser

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    and does pt/pd even shine?

    there are scenes of gold shining bright in several movies but can't think of any where its silver
    ive heard silver is the most reflective element, does that mean its the shiniest?
     
  2. Irons

    Irons Deep Sixed Site Supporter Mother Lode

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    Gold. You cannot polish a turd. :smokin:
     
  3. curmudgeonista

    curmudgeonista Banned

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    Austin-Powers-Silver-Fembots.jpg
    .....................
     
  4. Irons

    Irons Deep Sixed Site Supporter Mother Lode

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    Challenge accepted and upped..................


    goldgirl7.jpg
     
  5. 97guns

    97guns Gold Member Gold Chaser

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    need more silver examples
     
  6. AgBar

    AgBar Commodore Gold Chaser

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    Aluminum.

    http://en.wikipedia.org/wiki/Reflectivity
     
  7. Argentium

    Argentium Midas Member Midas Member

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    That graph of reflectivity vs wavelength was surprising to me, as I had thought silver had the highest reflectivity in the visible light wavelengths and gold had higher reflectivity in IR. This counts as my "learn something new everyday" moment! Thanks!!
     
  8. AgBar

    AgBar Commodore Gold Chaser

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    Depends on definitions, I suppose.

    As you said: In the near infrared (roughly 0.7 to 2 um wavelength) Gold is the shiniest, and Silver is generally more reflective than Gold in the visible (~0.4 to ~0.7 um). Aluminum is more reflective than Silver in the Blue region, Silver more reflective towards the Reds.

    But over a broad range from mid-IR up through UV, Aluminum is pretty much the "whitest" metal (reflects efficiently and more-or-less evenly for all wavelengths).

    There are optical coatings that are extremely efficient reflectors at certain wavelengths. These are usually called "laser mirrors" or some such, as they are designed for one specific wavelength: that of the laser source.
     
    Last edited: Apr 20, 2013
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  9. curmudgeonista

    curmudgeonista Banned

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    Charlize-Theron-Witch-in-Silver-1.jpg
    ................
    Charlize-Theron-Witch-in-Silver-3.jpg
     
  10. Zilver

    Zilver Gold Member Gold Chaser

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    shiner= A black eye, (periorbital hematoma)


    (Irons after disin' the smart metal) :cheerful:

    how-to-heal-a-black-eye.jpg
     
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  11. Irons

    Irons Deep Sixed Site Supporter Mother Lode

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    Hats off to you brother Curm for finding moar Charlize!! . :bowdown: :bowdown: :bowdown:
     
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  12. Irons

    Irons Deep Sixed Site Supporter Mother Lode

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    .......................
    w1.jpg
     
  13. Gcubed

    Gcubed Banned

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    May we PUHLEEEZE be serious??



    It weren't SILVERfinger!! :cheerful:
     
    Last edited by a moderator: Dec 26, 2015
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  14. Irons

    Irons Deep Sixed Site Supporter Mother Lode

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    ............................
    w1.jpg
     
  15. curmudgeonista

    curmudgeonista Banned

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    cate-blanchett-elizabeth-armor1.jpg

    morgana.jpg

    Lara-in-Armor.jpg
    ................
     
  16. curmudgeonista

    curmudgeonista Banned

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    Isn't having relations with a miner illegal?

    BTW, what movie is that from?

     
  17. gringott

    gringott Killed then Resurrected Midas Member Site Supporter

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    Correct. But you can roll a turd in glitter.
     
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  18. Gcubed

    Gcubed Banned

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    That is just sick!! :puke:
     
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  19. AgBar

    AgBar Commodore Gold Chaser

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    No more pictures of redheads dressed in silver, please. I'm about to pass out!

    :bloomingrose1kz::date::36_3_13::s11::36_3_12::love30:
     
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  20. Argentium

    Argentium Midas Member Midas Member

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    It's been a long time since Uni, but I seem to remember that reflectivity is related to how the d-orbitals are filled? Aluminum doesn't have any electrons in d orbitals, so how does that work?
     
  21. Ragnarok

    Ragnarok I'd rather be Midas Member

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    Silver is the preferred metal for telescope reflector mirrors in the visible spectrum, but must be overcoated to prevent tarnishing, this and the cost is why aluminum has mostly replaced it for this purpose.
    OTOH, gold is the preferred metal for reflective optics in the red/infrared portions of the spectrum.

    2c, R.
     
  22. curmudgeonista

    curmudgeonista Banned

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    Whatever you say Br'er AgBar...

    Silver_Bells_1.jpg
     
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  23. Gcubed

    Gcubed Banned

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    Curm, Just put Maureen O'Hara up and be done with it. :thumbs_up:

    :cool1:
     
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  24. curmudgeonista

    curmudgeonista Banned

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    Right you are...

    maureenohara.jpg

    O' course some of her best are in B&W, though...

    Maureen-O'Hara-Hunchback-1939.jpg

    Maureen-O-Hara..jpg
     
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  25. gliddenralston

    gliddenralston Gold Member Gold Chaser

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    I thought porn was barred from gim.
     
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  26. AgBar

    AgBar Commodore Gold Chaser

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    It's more about the outer-most (least-bound) electrons than about the specific orbitals that they're in. As you point out, the light metals, Al, Li, Mg, and such, only have s- and p-orbitals occupied in the ground state. But it is the interaction of the outer electrons -- 2s1 for Lithium, 3p1 for Aluminum, etc. -- with incoming light that causes reflectivity in a metal. It's a bulk effect of the conduction-band electrons in a metal; individual atoms act a bit differently.

    The "color" at higher energies (Hard-UV, X-ray, gammas) can be due to electrons closer to the nucleus, or even interactions in the nucleus itself: x-ray fluorescence, for example. But for anything near visible light energies, the outer electrons strongly dominate the effect.
     
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  27. AgBar

    AgBar Commodore Gold Chaser

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    ...:love30:
     
  28. Argentium

    Argentium Midas Member Midas Member

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    Makes sense. I'm trying to remember, perhaps I'm thinking that the d-orbitals have something to do with the color of copper and gold? Age is a terrible thing, sometimes. :(
     
  29. AgBar

    AgBar Commodore Gold Chaser

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    ...was this what you were thinking of?

    http://en.wikipedia.org/wiki/Relativistic_quantum_chemistry#Color_of_gold_and_caesium

    (couldn't quickly find a decent article that wasn't behind a paywall, so a few paragraphs from Wiki it is)
     
  30. Argentium

    Argentium Midas Member Midas Member

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    By Jove, you got it! Thanks! That bit about the color of cesium, I've heard about that before. I have a 5 g sample of it in my element collection and it looks silvery to me, but the Wiki reference said one must have a "significant" quantity of it, which evidently is more than 5 grams!
     
  31. voodoo1951

    voodoo1951 Silver Member Silver Miner

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    Ladies and gentlemen, it's a very simple answer, Break out the old slide rule and get back to me with your answer when you figure it out, OK?
     

    Attached Files:

  32. Argent Dragon

    Argent Dragon Site Support Site Mgr Site Supporter

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    The boring scientific answer : When it comes to reflective properties, there's a reason that silvering is used to produce mirrors.

    [​IMG]
     
  33. AguA

    AguA Seeker Seeker

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    It may be the silvering that reflects better but it's the gold framing that makes an ugly mug look prettier...lol.
     
  34. AgBar

    AgBar Commodore Gold Chaser

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    I mis-spoke in my reply above (#8, since edited) when I said that silver is only slightly more reflective than gold in the visible band. I was reading my own graph in frequency, when it was actually plotted in wavelength. My bad. And the quote of my original post shows the :censored:-up for all to see. :biggrin:


    To clarify: towards the red end of visible light, Silver is indeed the most reflective. Aluminum is more reflective toward blue.

    Near-Infrared to Mid-IR, Gold is the winner.

    Broad-band IR thru UV, Aluminum wins overall.
     
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  35. Ragnarok

    Ragnarok I'd rather be Midas Member

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    "How shiny" depends somewhat on the color(s)/wavelength of light under consideration. Here's a chart of metal reflectance (from Wiki). For those not familiar with the wavelengths as related to color, 400nm (violet) is the "short wavelength end" of the generally accepted visible spectrum, while 700nm (deep red) is the other, "long wavelength end" (some people can see a bit past these limits). Here are the representative wavelength ranges for the visible spectrum ("nm" = nanometers) to help interpret the charts:

    Violet: 400 - 420 nm
    Indigo: 420 - 440 nm
    Blue: 440 - 490 nm
    Cyan: 490 - 505 nm
    Green: 505 - 570 nm
    Yellow: 570 - 595 nm
    Orange: 595 - 620 nm
    Red: 620 - 780 nm

    Metal-reflectance.png

    Interesting to note that silver at one point in the UV, around 315-320nm, is essentially "black" (!).
    Also of interest is how much gold absorbs in the mid-to-short wavelengths, which is the reason for its apparent reflected color; OTOH if you look through a piece of gold leaf toward a bright white light, you can see the complementary blue-green part of the spectrum that passes into and through the leaf on account of its thinness.

    Just FYI, the "shiniest" materials are man-made optical coatings consisting of alternating layers of high-and low-refractive index materials deposited on a suitable substrate; these can be used to produce mirrors which reflect greater than 99.99% of the light which falls on them.

    More info at http://en.wikipedia.org/wiki/Optical_coating
    ...

    And now for something completely different, the worlds shiniest living thing, is a berry: http://blogs.discovermagazine.com/n...ny-fruit-pointillist-pixellated/#.UXRpqUqwX50

    R.
     
    Last edited: Apr 21, 2013

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