Casocryl ...

Casocryl is a cast acrylic sheet which appears Colored but becomes white when illuminated from the back. A material for directional signage and backlit channel letters.


References

http://www.sterlingpromotions.ca/CASOCRYL_sheet.html

Allikas: https://en.wikipedia.org/wiki/User:Nitinjd5/casocryl
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