Tattoos

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4464189/#R31

A recent study, using a model system of mice tattooed with a commonly used ink to investigate the transportation and photo-decomposition of tattoo pigment particles [ [|30] ], reported that the amount of ink in the mouse skin had reduced by 32 ± 16% of its initial value 42 days after tattooing. Furthermore, exposure of tattooed skin to simulated sun light and laser light also reduced the amount of ink particles retained in the skin [ [|30] ]. A related study examined the distribution and accumulation of micrometre- and nanometre-sized silver particles following subcutaneous injection in rats, and found that silver nanoparticles were distributed throughout the main organs especially kidney, liver, spleen, brain and lungs [ [|31] ]. By contrast, the micrometre-sized silver particles did not get into the blood circulation.

Chemistry of Tattoos

[]