non-sterilized objects which have been exposed to blood (and especially
sharply pointed objects) is hazardous.
Safety would dictate a process that renders used instruments and especially needles sterile before cleaning or disposal.
Disinfectants (meaning hard surface disinfectants) within the tattoo and piercing environment are most appropriately used on potentially contaminated objects which do not require sterilization, such as certain tools, counters, lights, chairs, etc.. Disinfection by physical means, such as in an autoclave, is also effective when used at less than sterilizing requirements. In the US, disinfectants designed for use on the skin are usually called antiseptics to distinguish them as a separate group with different specifications.
area contact requires sterilization.
Though this is
phrased as an absolute it is actually only a probability on a curve and an
item is generally considered sterile if only one microbe may survive on a
million sterilized products.
Sterilizing solutions require the object be effectively precleaned. The microbial load must be reduced by cleaning so that the process will be able to statistically achieve that one in a million probability.
Liquid sterilizing solutions
(Glutaraldehydes), such as
Metricide, Cidex, etc. have no place in tattoo or piercing as a
substitute for heat sterilization and should not be used.