Quote Originally Posted by Aron View Post
A die-hard Rodinal user would never say 10 ml...
See the middle of the left column on page 6 of this document:

It says (about Rodinal) "One-shot developer: with 500 ml concentrate about fifty films (135-36 or 120 roll-film) can be developed."

500 ml divided by 50 (80 square inch) rolls equals 10 ml. Confidence or crap shoot.