The Brits had a show “The 1900 House” that was brought up to current safety standards for a family to live in as it was done in 1900...
Any way, good wall paper at that time was maybe 30% arsenic. That was just one of the things that had to changed, not to mention any lead paint, lead pipes, asbestos, etc.
Lead is only a problem if you ingest it or breathe the oxidized dust.......