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:crackup: very funny Alex, but I think we should give this person an answer, we could use a few new members here.
There is more than one correct answer, for a 405nm violet laser, if it's focusable, as little as 35mW may pop a black balloon or burn black plastic, but the answer your probably looking for is more like 100mW or more. My 590mW 405nm laser will burn anything it's pointed at to the point of being a fire hazard.
Alan