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Very weird blank 700 MB CD-R media - Mac Applications & Software

Greetings! I got some bulk 700 MB CD-ROM media at a great price. They seem to work fine, and I have no complaints. However, I noticed that the damn things are virtually translucent. If, after burning one, I hold it in my left hand in order to write on it with my right hand, I can see all my fingers quite clearly, peering straight down through the top. If I look at it obliquely, it appears opaque. Any comments on this? George Fowler...

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  1. #1

    Default Very weird blank 700 MB CD-R media

    Greetings!

    I got some bulk 700 MB CD-ROM media at a great price. They seem to work
    fine, and I have no complaints. However, I noticed that the damn things
    are virtually translucent. If, after burning one, I hold it in my left
    hand in order to write on it with my right hand, I can see all my
    fingers quite clearly, peering straight down through the top. If I look
    at it obliquely, it appears opaque.

    Any comments on this?

    George Fowler

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    George Guest

  2. #2

    Default Re: Very weird blank 700 MB CD-R media

    In article <ipbbc.net>,
    George Nospam <net> wrote:
     

    Too easy...

    You see visible light, not the infrared that CD-drives use. To the
    drive, in the spectrum it can "see", the disk is probably close to 100%
    opaque/reflective. To you, in a different spectrum, it looks clear.
    Transparency/opacity in one region of the spectrum says nothing about
    the transparency/opacity a material will exhibit in another, totally
    different, region of the spectrum.

    As an example, consider X-rays. A piece of plastic may very well be
    absolutely opaque to visible light, but move up the spectrum a bit, into
    the region occupied by X-rays, and it's as perfectly transparent as the
    finest plate of glass you've ever looked through. Similarly, a piece of
    lead crystal is nearly perfectly transparent in visible light, but in
    the X-ray range, it's as opaque as a solid brick wall.

    Exactly the same thing applies to the infrared that CD drives
    produce/see. Some materials will be transparent to it, others will be
    opaque, and others will be somewhere in between. Yet the materials that
    are opaque to it may very well be completely transparent in visible
    light.

    --
    Don Bruder - net <--- Preferred Email - unmunged, SpamAssassinated
    Hate SPAM? See <http://www.spamassassin.org> for some seriously great info.
    I will choose a path that's clear: I will choose Free Will! - N. Peart
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    Don Guest

  3. #3

    Default Re: Very weird blank 700 MB CD-R media

    In article <ER54b.16769$sonic.net>,
    Don Bruder <net> wrote:
     

    Thanks for the crystal clear explanation!

    George

    George Guest

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