that blue one really pops!
They are Great Mik,
Are they from a Craft or Hobby Store?
They look like they could be DNA (metho) solvent based.
Terrific, they work well.
I love that pen... carry it with me at least once a week! In the year since I got it from Mark I still regularly get compliments on it - wish I could take credit for it.
the blue and green are awesome