imaguid:
i wonder what would happen if, instead of using chalk, people used that hydrophobic coating that makes water bead off of virtually anything, so that normally you can’t even see there’s anything there but when you add water the message is revealed.
That still involves coating a surface with a chemical, so is probably legally considered to be graffiti. I’m curious if people could get away with reverse graffiti though.
Reverse graffiti[note 1] is a method of creating temporary or semi-permanent images on walls or other surfaces by removing dirt from a surface. It can also be done by simply removing dirt with the fingertip from windows or other dirty surfaces, such as writing "wash me" on a dirty vehicle. Others, such as graffiti artist Moose, use a cloth or a high-power washer to remove dirt on a larger scale.
Reverse graffiti has been used as a form of advertising, although this usage has been controversial, ...
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