[bentpins]

Didn't mean to come across as a troll, this is how I remember CDs, with rainbow diffraction. https://www.google.com/search?tbm=isch&q=cd

[simias]

I think at such shallow angles it's the plastic surface that becomes reflective, not the metal layer with the pits and grooves. Hence the lack of diffraction (and hence why it works with my black PSX disc).

[kevin_thibedeau]

She's using a CD-RW with blue/purple dye. The reflection is definitely coming off the surface.