Check this video out: https://instagram.com/p/1LQgpuHjLd/

Description: Caught this guy rubbing a puer brick on the street in the
Kunming market to make the wrapper look "old."

Not my own video, found it on Reddit.

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Dario Niedermann. Also on the Internet at:

gopher://retro-net.org/1/dnied/ , http://devio.us/~ndr/