That's because you used the word 'guilty'.
This is indeed a fountain pen board, and I am indeed interested in (some but not all) fountain pens, but it is divided into sub-fora. I am not greatly interested in ink colors or in papers, and am not often on those parts of FPN.
Above all, I'm not a bit interested in the idea of feeling guilty about this or that. Having learned that, according to the Buddha, suffering is universal, I am willing to accept that I suffer about A and other people suffer about B.
Questions of wearing black nail polish I also leave to others. Who are, in quotidian fact, very much younger than i am. And some of them attractive in mind and/or body. There I don't feel guilty, but I do in certain cases feel rather wistful.