Prison tattoos! Yes indeed. I have many. I have built the machines, made the ink, and sat in the cell for many, many, hours and days, doin tat work. I have seen some tattoos that look like, well, whoever did that work probably got a good asswhoopin'. And on the other hand, I have seen some prison tattoos that are mind boggling. Single needle, which is a guitar string bent into a pencil eraser off-center. the eraser is pushed onto the driveshaft of a cassette walkman moter. This is all assembled on a toothbrush that has been cut down heated up and bent 90 degrees at the top to support the motor that is fastened with whatever kind of tape is available. We would remove the 'ball', from the bic ball point pen, and there you have it. If you build the machine correctly, they will work like a champ. The best 'ink' was lamp black. Soot from a candle. All this and a lot of TIME, and in the right hand, will produce some very impressive work.