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B How is thermochromatic rainbow paint made?

  1. Oct 29, 2018 #1
    I'm curious how thermochromatic paint is made that has many changing colors corresponding to different temperatures? Read that liquid crystals are used but they same as in LCD displays or it's somekind another chemical?
     
  2. jcsd
  3. Oct 29, 2018 #2

    anorlunda

    Staff: Mentor

  4. Oct 30, 2018 #3
    What it could. I checked Wikipedia. These are liquids crystals but I have no idea what chemicals used and where to find them. That's why I'm hoping learn something from experts.
     
  5. Oct 30, 2018 #4

    f95toli

    User Avatar
    Science Advisor
    Gold Member

    A liquid crystals IS a type of chemical. It is basically -as the name implies- a liquid (with some short range order, hence the "crystal") with very interesting optical properties.
    Hence, the answer to your question is that you buy them from suppliers of chemicals. If you go to e.g. the Sigma-Aldrich website and search for "liquid crystals" you will get lots of hits.
    Note that the chemical formulas for the C that are used commercially tend to be proprietary, i.e. you can't buy them and the manufacturer wont tell you how to make them.
     
  6. Nov 11, 2018 #5
    Anybody tried extracting liquid crystals from LCD displays? I do have defective PC LCD display from which I plan to get polarizer film and maybe make lamp from backlight, it would be great if I could make as well thermochromatic paint from display.
     
  7. Nov 11, 2018 #6

    anorlunda

    Staff: Mentor

    I see several LCD sheets, and also thermochromatic paint sold on amazon.
     
  8. Nov 11, 2018 #7
    I can't find liquid crystal based paints in online shops. I mean thermochromatic not those with just two colors but LC which have beautiful rainbow colors corresponding to minute temperature changes.
     
  9. Nov 11, 2018 #8

    anorlunda

    Staff: Mentor

    I'm not pushing Amazon, but here are some things I found easily.

    To get a rainbow of colors from minute temperature changes, you would have to experiment. Put on your artistic experimenter's hat.
     
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