Ballpoint pen ink, guitar wires and engines from a toy are used by inmates to crudely carve tattoos into their fellow prisoners behind bars at a prison in Cebu City, Philippines.
Tattoos -- or "patik" as the inmates call them -- are commonplace in prisons though these types of tattoos are considered a prison violation in the U.S.
In many places outside the U.S., prison tattooing is fair game, and can be used to designate allegiances within the prison or as a form of self-expression in an otherwise barren place.
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