Probably this style was born in the jails in 1970s and 1980s. To realize these tattoos you use only black ink in various tonalities. Known also as “Jailhouse” or “Joint Style” it has been conceived by the prisoners that had at their disposal a lacking quantity of materials. Usually the various tonalities of black and grey are gotten diluting the black ink with distilled water, or mixing black ink with small quantities of white ink. To inscribe on the skin you use a single needle. The artistic subjects can be various.