[azubinski]

It is obvious that if you correctly add pieces of something like this to a viscous medium (so that the pieces are on the surface of the medium), you will get a viscous material with a visually observable diffraction effect:

https://bartovation.com/product/other-lab-supplies/diffracti...

The other thing is unclear:

Why gnaw on diffraction sheets?

Will this make chocolate taste better? Will this improve your health? It's all very exciting and mysterious.

[lupire]

The reason to use chocolate is that it is able to form a diffraction grating, so you don't have to eat the plastic.