What material is used in road-side signals to make them glow when light falls on it?

charumathi

charumathi

@charumathi-rXfQWc • Oct 27, 2024
what is the element used in roads for signalling which is red colour and glows in night like radium?
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  • gohm

    gohm

    @gohm-F3UUpP • Jan 26, 2009

    Re: What material is used in road-side signals to make them glow when light falls on

    Can you be a bit more specific? I cannot tell if you are talking about signal lights, signs or pavement markings?
    0
  • Ashraf HZ

    Ashraf HZ

    @Ash • Jan 26, 2009

    Re: What material is used in road-side signals to make them glow when light falls on

    If you are referring to Cats eyes (the road markings) and signs, these are reflectors of light rather than them glowing, making use of principles of optics.
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  • charumathi

    charumathi

    @charumathi-rXfQWc • Feb 1, 2009

    Re: What material is used in road-side signals to make them glow when light falls on

    no i was saying the red sticker or paint something else that is found in milestones....i wish to know what was the element present in it makes glow at night....
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  • quartz

    quartz

    @quartz-kczW97 • Feb 1, 2009

    Re: What material is used in road-side signals to make them glow when light falls on

    Here you have what you need:
    <a href="https://en.wikipedia.org/wiki/Retroreflector" target="_blank" rel="nofollow noopener noreferrer">Retroreflector</a>

    The same principe is used in your red stickers...
    Alot of small crystals (size between dust and sand) are trapped in the transparent reddish plastic.
    And the shape of those crystals are made to reflect back the incoming light.

    Or a single transparent plasic is processed with a laser to modify its internal structure to creat some reflecting shapes...

    It is not a specific metarial... but an optical structure...
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  • charumathi

    charumathi

    @charumathi-rXfQWc • Feb 1, 2009

    Re: What material is used in road-side signals to make them glow when light falls on

    thank you frnd.😀
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