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Thread: Light / Laser to change paint color on distance?

  1. #1 Light / Laser to change paint color on distance? 
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    Hi,


    naive question: Is there something(light, laser, whatever), that one can project to a wall and thatchanges the color of the paint? Duration and distance are secondary,altough the faster and farer away the better.


    Thanks!


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  3. #2  
    Forum Professor pyoko's Avatar
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    If you have photosensitive "paint" or surface, then sure. Photosensitive/ heat sensitive. Like you get in those cheap "mood rings" that contain thermochromic elements. Instead of using your body heat you could shine an IR laser on it, and depensing on how long you leave it on for, the surface will change to different colours.

    Liquid crystal - Wikipedia, the free encyclopedia

    T
    hat's one way of doing it. There are others that are more permanent and do not change back. Some do but with the application of water, such as this one:

    http://www.wired.com/gadgetlab/2011/...nsitive-paint/

    Paint the dyes onto any surface (fabrics, paper, wood, whatever) and put it out in sunlight. A few minutes later, the dyes will have darkened. Partially blocking the light with a negative or a stencil will give you photos and patterns.
    Once done, wash it with water to “fix” the image.


    It is by will alone I set my mind in motion.
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  4. #3  
    Time Lord
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    Ultraviolet light causes ordinary white wall paints to fluoresce (glow). The degree of fluorescence can vary a lot between paints which are otherwise indistinguishable. Because of this, a painter's attempts may show patchy under certain lighting. I've actually exploited that quirk as an aid when painting.

    A fluorescent lamp may do; use a blacklight for best effect.
    A pong by any other name is still a pong. -williampinn
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  5. #4  
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    Hello,

    thanks for the replies! But it is not quite what I am looking for. It would have to be a permanent change, for which the wall would not have to be changed in any way before.

    More hints welcome!
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  6. #5  
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    Quote Originally Posted by asd3456 View Post
    Hello,

    thanks for the replies! But it is not quite what I am looking for. It would have to be a permanent change, for which the wall would not have to be changed in any way before.

    More hints welcome!
    I can't give you any specifics asd, but i was havign a conversation about the way light reflects from objects and from what we were discussing, I would geuss that if you could somehow change the amount of electrons in the paint substance then you could change the colour. So it would have to be some kind of lazer which adds or removes electrons from the paint.

    Thats my very unknowledgable contribution based on a chat I had in here with a stranger... I hope it at least gives you some hope.
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