I am using purple and green on. Especially I like green pen. It's light color but not really light. You clearly see its writing. I like use it make my violin playing comment and working notes.
The fist time I used one of the pens it did not consistently write clearly. At times it didn't write at all. I'm hoping the rest of the pens in the package work better.
I like the pen because it was inexpensive has a non-slip grip is a gel and is retractable. I see no signs of leakage. Has a smooth delivery of ink and dries quickly.