> So a shiny plastic has a high ior I assume. Then it makes sense.

What makes a plastic shiny or not is usually the geometric finish on the 
surface, not anything to do with the material itself. It all depends on 
the surface finish of the mould tool that was used to make the part. It 
can be anything from high polished (to give a high gloss finish) to a 
very fine texture (to give varying degrees of matt finish) to a large 
patterned texture for something like a leather effect on car trim.

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