Hello. Just as the headline states - I have copped a secondhand DS1/PS1 controller in emerald green locally, and I am genuinely curious about the uh...yellowing that is shown around most of the "edge" areas; but especially most heavily concentrated around the shoulder buttons.

Any anons good with identifying as to whether this might be either due to:

>smoking residue/exposure
>urine/piss
>immense and consistent light exposure
>etc/misc guesses?