video Scratch Hologram Detailed Instructions for Teachers
Detailed instructions on making scratch holograms and how to do it cheaply with a whole class.
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.
Bill Beatty did it with glossy opaque plastic, so it doesn't need to be transparent, just shiny.
barkergk (author)  Dominic Bender2 years ago
Try it Satrek, Great idea! Let us know how it turns out!
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...
mjursic2 years ago
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.
goldbar29752 years ago
you should see what it looks like on a cd. those are cheap like 16cents if you buy 100 of them
put up a picture of it if you try it :P
wc20002 years ago
Does this have to be made out of plexiglass in order for this to work? I've never s=heard of these but I want to make some.
barkergk (author)  wc20002 years ago
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.
That's superb ! Really really good, thanks for sharing.
dritonsyla2 years ago
hahha thatss amazingg dude
matthewu2 years ago
I think it's a great idea, maybe ill try it sometime
rimar20002 years ago
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.
Buck_I_Guy2 years ago
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.
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.
barkergk (author)  eric.atkinson2 years ago
I will look into it. Thanks!
barkergk (author) 2 years ago
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.
ehudwill2 years ago
Thanks for sharing. I like this idea.
Kiteman2 years ago
Would you get similar results from clear acrylic?
barkergk (author)  Kiteman2 years ago
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.
barkergk (author) 2 years ago
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.