Dear Dr Chemical,
Thank you for your time.
I purchased a brand new 1990s telephone. The photos attached to the question show both models of phone. The left phone is white in appearance. The right phone is coloured yellow.
My new 1990s telephone is in its box. It is white in appearance. I would like to know how to prevent the white phone as exemplified on the left side of the photo from turning yellow as exemplified on the right side of the photo.
First I am aware that sunlight may affect the colouring of plastic.
Are there any other factors which change white plastic to yellow?
Note: I know how to reverse the yellowing process. I have successfully applied hair creme containing H2O2 on the surface of a yellowed plastic and exposing the plastic in the sun’s direction.
I want to know how to prevent the plastic from yellowing.
Anthony of Sydney