The ink is incredibly light. I wasn't expecting something dark (I was looking for bright/medium), but the ink is even lighter in the cartridge in person. Would probably make a decent highlighter ink.

normal

The ink is like a highlighter color. This ink was to thick and would not flow out of the pen it wouldn't work and was not able to use so I do not recommend the green ink

the color is really clear and you really cant see the ink when writing.

Very transparent and useless in a fountain pen