Private Reserve Plum is a bright purple when it first comes in contact with paper. As it dries, it changes to a darker purple. The ink is really aptyl named. Plum is really what shade it is. In my Kaweco M nib, it is put down a wet and thick line. I would think it would be much more useable in a F or EF nib. Flow is smooth but there is some show through on cheaper paper.