HARMFUL CHEMICALS IN TATTOO INK
Mercury, cobalt sulphate, other soluble cobalt salts & carbon black are in Group 2B, which means they may cause cancer in humans
Cadmium & compounds of cadmium, on the other hand, are in Group 1 (carcinogenic to humans)
我见过tattoo染料进到淋巴系统的图片
还有，tattoo 鼻环之类给人感觉是某种印记
