Markus Fabke
Thank you.

I have taken for an old CD or DVD, then I gently, the film is taken out between the two plastic discs.
In addition I have the DVD is broken, then I glued the foil behind the transparent plastic parts.
That is the effect which can be seen.

cu
Markus

Ingo F
Hey Markus, thank you for this hint with the CD/DVD foil. Will try it on my T-90. 🙂