I am looking for a fine- (or small-)tipped permanent marker to write on Petri dishes that is visible under a blue light or a transilluminator. It would seem obvious, but it is a nuisance.
- The Sharpie Neon series are too thick.
- Highlighters and all the arts pens I have tried rub off the polycarbonate.
- The red colour from Staedtler lumocolor (black body) shows up faintly —none of the other do— but too faintly.
- The Neon series from Staedtler triplus fineliner (gray body, triangular) rub off
So I would like to find what solutions other have come up with or if there is a brand that works well.