https://en.wikipedia.org/wiki/Photocopier https://en.wikipedia.org/wiki/Photocopier There was carbon paper, other types of treatment, and non-paper objects suc

https://en.wikipedia.org/wiki/Photocopier https://en.wikipedia.org/wiki/Photocopier There was carbon paper, other types of treatment, and non-paper objects such as plates; think about the intersection with photography. The "xero" prefix means "dry" which would win out over "wet" chemical processes.