At an old temp job I had, my manager, much older than me, habitually photocopied faxes as they were received precisely because the thermal paper fades over time

At an old temp job I had, my manager, much older than me, habitually photocopied faxes as they were received precisely because the thermal paper fades over time. Even stored well, in the dark, in a dry box, they'll gradually fade over time. Leaving them exposed to the light will fade them really quickly.