My uncle has physical copies of photos that are more than 30 years old, that still look like new. I have copies of some of the photos that he has, but the colors have deteriorated so much that a lot of them are unrecognisable.
The photos are kept in albums inside plastic sleeves. What he does to preserve them is to take the photos out of their sleeves every few months and keep them outside for a few hours in a dry place. He makes sure his hands are clean and dry before he handles the photos.Then he puts the pictures back in the albums. He has done this diligently over the years.
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