How Tattoos Work
Any given tattoo artist may work with a range of different needle groupings in order to create their own style of tattooing, it is truly a tiny stainless steel paint brush, and what sort an artist chooses is a matter of preference.
Tattoos are injuries to the skin. Your bodies immune system only has a finite amount of energy to dedicate to healing itself and so it is very helpful to healing a tattoo if you are otherwise in good health.
Get into the science of ink and the variety of things that go into different colors.