Scratch Hologram Detailed Instructions for Teachers

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Detailed instructions on making scratch holograms and how to do it cheaply with a whole class.

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    20 Discussions

    I was completely astounded when I saw the effect. I need to try this myself. I have some kind of "transparent plastic sheet" in my workshop, I need to check which material it actually is.

    I was wondering, though, how the effect would be with "flourescent" plastic, i.e. the kind that "shines" at the edges and can be found, say, in Ponoko's material list. I think I have some leftovers of that, too.

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    ZaloDominic Bender

    Reply 5 years ago on Introduction

    Bill Beatty did it with glossy opaque plastic, so it doesn't need to be transparent, just shiny.

    First atempt is a failure, but the material I used turned out to be polystyrene. It's either that or thas I used the tip of a wood scred for scratching...

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    mjursic

    5 years ago on Introduction

    I tried it on a CD and it doesn't work--the mirror finish provides too much interference. I'm going to try sanding the back off to see what it looks like.

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    barkergk

    5 years ago on Introduction

    Plexiglass is a brand name for acrylic. Any non-glass window replacement material will probably work as long at it will scratch. Polycarbonate is a little more durable. Even CD covers will work, but they get other cratches very easily.
    Go to your local glass shop and ask if they have small scraps they will give you or sell you at a nominal price. Good luck! Let me know if you have any more questions.

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    matthewu

    5 years ago

    I think it's a great idea, maybe ill try it sometime

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    rimar2000

    5 years ago on Introduction

    This is wonderful.

    Please add English subtitles to video. Not ALL YOUR WORDS, only an abstract of main points. Most of we non anglophone can read and understand, but not when hearing it.

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    Buck_I_Guy

    5 years ago on Introduction

    This is pretty slick. It would even be a nice simple project for parents to do with their children at home maybe on a rainy day.

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    As a teacher I would love to be able to see this in my classroom. Perhaps you could postthe video on teachertube or youtube/educate so that the school filter would allow it on the majority of campuses. Great idea though.

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    barkergk

    5 years ago on Introduction

    MORE CLARIFICATIONS AND ADDITIONS:
    1. Lexan is a brand name for polycarbonate. Plexiglass is a brand name for acrylic.
    See my response to Kiteman below for pros and cons.
    2. Outside, the holograms should always be viewed with the sun at your back. DO NOT look through them at the sun.
    3. The finished holograms can be protected from further scratching with a clear sheet like a cell phone screen protector cut to size and still see the image.

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    barkergkKiteman

    Reply 5 years ago on Introduction

    Plexiglas is a brand name for acrylic. It is the most easily obtained from a glass shop. It is softer than polycarbonate and tends to scratch more deeply which is undesirable. It also tends to melt an resolidify where it is sawed.
    It is a tradeoff. IfI could get scraps at a glass shop for free I would use that in a classroom. Otherwise I would use polycarbonate.

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    barkergk

    5 years ago on Introduction

    CLARIFICATIONS:
    You can only get 20 - 2in x 2in squares out of the 8in x 10in polycarbonate sheet, not 40.
    Polycarbonate can be cut with a bandsaw or jigsaw without chipping or melting. You can try it with a table saw, but go SLOWLY. A scoring tool does not work well with polycarbonate in my experience.