Based On 5 reviews.
I was excited by the reviews for the quality of this ink, but, sadly, I never got a chance to write with it. The cartridge fit into the slot on the nib of my pen, but it was too fat for the barrel of the pen to fit over it and screw on. I couldn't use the cartridges at all.
I have tried many different inks over the years. These are simply the best; great flow performance and color selection.
When I saw there was only 1 review and it was not about the ink quality I knew I had to write a review. I've been working my way through all of CO Pen Co colors for several years now, I've tried some of the other manufactures inks that the company supplies and they are not nearly as good as these. I've also tried more expensive and cheaper inks from other sites and I keep coming back to these inks. The colors are vibrant and long lasting (no fade). The ink flows out of the nib of my fountain pen much better than other brands. I left one pen sitting for a month and the ink dried in the nib, I put a new cartridge in and in no time ink was flowing again. My favorite colors so far are the California Teal, and Blue Black.
Cross refills I have been using seem only half full of ink ;o<
These Colorado Pen cartridges fit, are full, have many more colors available, and aren’t very tricky to install..Thank you ;-)
The short barrel does not fit my Watrrman fountain pen as stated. The bottom part of the barrel is bigger and doesn't screw on.