I've put NOS bellows on a few old Edwardian Kodaks that take 120 film and used them with more or less good results.
My next project is a No. 2 Folding Pocket Brownie with a red bellows. At first inspection the bellows is light tight and I don't want to replace it (unless you have a NOS red replacement!).
The question is this: any suggestions on brightening the bellows? The camera on the whole is in nice shape but the bellows seems faded. I think they are actually paper on the outside.