Waterman Nostalgia Fountain Pen Ink - 50 ml Bottle - Mysterious Blue

This is my go-to ink at work. It performs well on a range of papers, from low quality, absorbent copy paper to 100% cotton letterhead; no (or minimal) feathering & bleedthrough on the papers I've used. The color is like a deepened and muted teal. I <3 it! It's dark & subtle enough to be business professional but interesting enough to be fun & unique. I also prefer to not use black ink for certain documents so as to show it is an original. I experienced good ink flow with my Kaweco Classic EF.

One of the safest inks around. This would be my go-to ink for daily use, however, it is well known for turning teal as it dries on the page. Otherwise a superb ink: smooth, free-flowing, good drying time, and non-staining.

This is a superb, "old school" ink with a lovely hue: warm without being too reddish, vibrant without turning loud or showy. In my opinion, it is one of the best browns one can find at any price.
It is neither particularly water resistant nor fade proof, but then fountain pen inks of this classic type never pretended to be. It does, as many inks do, become more "permanent' as it cures on the paper: things written a year ago don't wash out as much as those only a week or so old. If you are writing your will, signing a legal document, or penning a manuscript, might I suggest something like Sailor Nano Ultra Black? For everything else, especially if you like brown, this is a lovely, beautifully made and affordable ink. Highly recommended.

Excellent ink for fountain pens, ok for calligraphy pens. A bit too thin for my 1.9mm nib lamy calligraphy pen, it feathers out noticeably on complex letters that require dark, broad strokes. But, it isn't advertised as a calligraphy ink, so I can't ding it for that! Would be great for day to day use in the office or journal.

An extremely well-behaved, low-priced ink. I use this in my Lamy Safari F, and it writes well on many types of paper with fairly little feathering or bleedthrough. However, if you are looking for a DARK, black ink, this may not be the choice for you; from my experience, Waterman black seems to be more of a nice dark grey tone. I also don't think it's waterproof. But it does produce some very pretty shading and is a pleasure to write with!