This tattoo is permanent, pain-free, and might soon come in the mail

The refurbished railway station in London I entered last week had none of the usual signs of being a tattoo studio. The walls were devoid of any art, and there were no reclining chairs or massage tables in the room. The only tattoo gun on the premises sat in a display case instead of buzzing in someone's gloved hand. I felt like I was getting inked in a half-assembled biolab with some interesting benefits.

I'm not trying to put on a show of bravado when I say my latest tattoo didn't hurt. Getting the small sparkle lineart permanently marked on my skin was a genuinely painless experience. It was over in seconds, and didn't involve any grisly …

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