For the first fp that I've held in my hands since I was 15 - I'm 61 - I've chosen a vintage Parker 51. Parker Pen Company recommends that I use only their Parker Quink ink. Some reviewers declare that this Quink is a magnificent rich velvety black (and contains lubricant) and other reviewers declare that Quink's dry state is a watery dark gray. It's this latter quality that I abhor - I seek an awe-inspiring memorable velvety deeply-saturated permanent black that will not cause problems with my 51's mechanism. One reviewer recommended Diamine Onyx Black but this too lacks the sine qua non pizzazz. I solicit your recommendations.