Can new colours be given to new tags? I wanted to add new tags to the standard set AND to give them colours of their own but I have not been able to do it. For instance, I would like to have a brand-new Black tag. Any ideas?

Thanks in advance,

Nacho

P.S. Notice that I am referring to Yosemite
You can only use the set tag colours; red, orange, yellow, green, blue, purple, or gray.

You're not able to set your own colour, so the closest colour for you would probably be gray.