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The crack noise can be generated on skin with no tattoo ink - see photo above. It can be generated on a white piece of paper. It has nothing to do with the treatment!
Most lasers are designed so that the end of the tip should be in contact, or just slightly above, the skin surface. No further than a few millimetres.
That way the correct spot size is applied and, hence, the correct fluence. If you’re going to do it, do it correctly (according to some singer bloke...)
Hope this helps, Mike.
Mike’s Blog Posts 143