I did it. I got one! The question is: am I happy with my decision? The answer isn't no, but the answer isn't yes either. From far away, the tattoo looks pretty cool and subtle. But close-up, I can definitely see where the line became uneven and (what's the word), weaker? But, like the kind of pen you use on paper, unless you use a stencil (or use a robot), you're not going to get a perfect result. Also, from what I've gathered, white ink is not the easiest to work with. Okay, okay, enough blather.
You can see why I didn't post a picture of it sooner; the white inks look really creepy when they're fresh... Ruby offered touch-up services, but I'm not sure how one would be able to touch-up such a line without making it thicker, and that's not quite what I want. I think the moral of this story is that I went into this wanting something way too perfect and got only what was humanly possible. Maybe? Maybe another artist could have done a better job? Maybe not? The white inks can turn out really bad if you don't know what you're doing. Anyway, to summarize: I do not regret my decision and I am definitely happy I chose the white ink. But I am less inclined to go tattoo crazy in the future. I learned that even after searching, establishing reputation, waiting, and paying a good penny... you are not guaranteed to walk away with something exactly as you imagined it. This observation is (ironically) applicable to other areas of my life...
