Yep,
topic has come and gone several times recently..
There are several ways to simulate it, until now I haven't had time to test myself which is best:
- Get some waste negative photo negative, cut to size and glue it on.
- Same as above, but with candy paper or some other stuff that gives different colours depending on the direction from where you look at it.
- Use the airbrush: spray some coats of (Tamiya) clear red, followed by clear blue and finally silver on the back of the clear part, or the other way around if you do it to the front.
Those are ways it's mostly done, but again, haven't tried it myself.
Maybe someone else might give comments on the best option, I know Gino (HeavyArty) has tried it.
Hope this helps..
Johan