Platinum Fountain Pen Dye-based Ink Cartridge - Blue Black - Pack of 10

No problems with the ink. Writes smoothly. The blue/black is kind of dark but I like it.

I had a small pile of these Platinum Blue-Black cartridges that came with some other Platinum pens I had bought. They sat in a drawer until I got a deal on a customer-return Platinum Curidas pen without the converter for bottled inks. Lacking anything else onhand I put one of the carts in the Curidas.I really like the ink - combined with the Curidas' EF nib, Platinum BB works well on even the crummiest paper, and the color is even pretty nice for a "manufacturer default" ink. Water resistance is a definite plus. I did end up buying a converter for the Curidas, but I also purchased a pack of these cartridges for use with this pen. It's a very nice utilitarian ink that suits the utilitarian style of the Curidas well.

This is a great quality “retro” blue-black ink that fits and works great in my Platinum Preppy pen.

Great Value for the money; just did not fit my pens

I like the color and how the dye dries pretty quickly. Decent price for what you get and easy change over.

Good color and flow

this is the ink i use in my favorite cartridge pen. why not enjoy writing by hand again?

Delivered as promised.