WatermanFountain Pen Ink Cartridges, Long, Mysterious Blue, 8 Count

It's a dark blue colored ink that is comfortable for me to read. It writes smoothly. Waterman Ink cartridges are relatively large and last a good while. Just remember, as a "washable" ink you need to make sure not to drip water, coffee, etc on your page.

These cartridges work great. They are easy to install and fit perfectly in my pen you must remember to push it in the nib from the little dark blue/black bump firmly they screw the top back on. The ink dries quickly and will flow immediately if your nib is clean.

A very nice blue-black.Writes nicely in my Watermen pen.Highly recommend.Good price.

like quick shipping. ink works great in my fountain pen

It's ink. Not sure what more you can say. I have to sign a lot of documents so I always choose blue ink, and this blue is very clear, vibrant and smooth. Really stands out on paper and this is my go to refill for all of my fountain pens.

Beautiful pen that offers a unique writing experience. It is very smooth and buttery on paper. No feedback or scratchiness. I’m glad I chose a Waterman

I have been writing with a fountain pen for 60 years, and have experimented with dozens of inks. Waterman is still the best and as I have 7 Waterman F.P.'s these cartridges come with me when I travel. Just a superlative product

I use my favorite Waterman fountain pen daily. It is so nice to have handy to carry cartridges like these when I need to refill my pen. The ink is a beautiful blue, and washable, just in case should I accidentally get ink on my clothing.