Photo filters to help read old brown faded letters?

[Fbcbsjdb87273]

A relative got out a letter from 80 years ago and I've taken photos of it, but it's faded & brown and where it was mended with sellotape it's gone very brown!
Any tips for filtering the photos so I can read it better?

Adjust the contrast and brightness on the photo in your phone to get a better read. If you want it doing properly check out fiverr lots of people on there to choose from with good reviews and ridiculously cheap

Or post it on here and we'll do it for free :P