Quote Originally Posted by Kevin Caulfield View Post
The Film Developing Cookbook in its current edition has the formula correct, with 5ml of a 1% benzotriazole solution.
I think you are referring to the DARKROOM Cookbook 3rd ed 2008 p216 which is correct.
AFAIK the most recent revision of the Film Developing Cookbook dates from 1998 and has the wrong formula 50ml on p61.