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the 2 exceptions are titanium and gold

Are you sure about this? A friend hit me with a pencil 5 years ago, and this caused some graphite to enter inside my skin. The graphite is still there to date and I got no pain, infection, reaction from it.



I still have a graphite mark in my wrist from over 20years ago. (Jabbed my self by accident in elementary school and the mark never went away.)


Keep in mind that the top 2mm of your skin is mostly dead material. Nothing will happen if you put something into it, and there are places where it doesn't get renewed.




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