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Lead paint? :)

- Just kidding...

Faraday prison cells.

or just a faraday cage.

Why kidding? That should work. Paintings with metals is really a thing.

Lead is toxic to human, any other metal can do.

I suspect any quantity of metal sufficient to act as an RF shield or Faraday cage would be toxic to humans in paint form.

Unless ingested, iron should be fine. It is also low maintenance.