I have seen a question here about how to restore a receipt that has faded. What I want to know is how to prevent receipts from fading in the first place.
I have some receipts from a recent vacation that I want to keep as souvenirs. I was thinking of putting them in a PVC-free and acid-free protective page (such as this) in a binder along with other documents/pamphlets I collected. What else can I do to prevent them from fading?