I've used many different inks in my day. From Krink to OnTheRun, and now there's a new ink that's out there. Its called Smash Ink, and this ink is excellent. I recently bought a couple 8 oz. bottles to test it out, and I am impressed. Works best with mops, but can be used with any refillable marker. This ink makes perfect drips and makes smooth lines when you need it. Exclusively sold at Art Primo and comes in multiple colors. Check out Art Primo's video demo of Smash Ink.