Changed rating from 4 to a 5. This a fantastic ink. It performs well in many of my other pens and the color is just vibrant, and is a decent shading ink, depending on the paper used. It is vintage pen friendly safe so that's a plus. Now it stays in use in atleast one pen from my collection.It's more of teal than green which is alright with me. Writes somewhat on the drier side so I'd rather it stayed inked in my cheaper pens from now on. Seems as if it has the potential to clog up the pen. I still enjoy the color but am not sure if I'll commit to it permanently. The Japanese brand inks in comparison write like silk, and feel as if they keep the pen cleaner too.