What would be your inks that make you feel happy when you write with them?

Obviously colour is an important part of this, but also, for instance, it is hard to feel happy writing with an ink that hurts your eyes, takes a year to dry (*cough* Majestic Blue) or which clogs the pen (*cough* Diamine Blue Black). One of my happiest inks is Waterman Violet, which is a nice bright colour yet not too bright, and also has a nice regular flow and works on any decent paper. I'm also fond of the Infamous Bay State Blue, even if it is turning my pens into Communists or whatever it does, though I have to dilute it a little or it will eat through the paper.