Hey I have a question, I was walking to the tram station a few hours ago after work, and I grabbed hold of the railing on my way down the stairs. As I stood waiting for the tram I touched my lips and shortly after that licked them and tasted iron, as if I d been holding coins. When I sat down In the tram a lady pointed out to me that my face was covered in black smudges off the railing from where I had rubbed my face. It washed right off but my question was really about the fact that I licked it earlier on, and thousands of people touch the railing daily. Thanks for your help.