Some of them are so exclusively pink I'm not sure they can be restored to their original colors...
I'm curious, do you know what kind of film stock it is?
I often wondered the same question myself.
Although I only buy movies I love, with a high replay value or which I'll want to show to someone else at some point, I know there are a lot I'll never watch again, if only because of time constraints.
But I keep buying and collecting. It's compulsive...