Quote Originally Posted by Michael R 1974 View Post
I believe rather than sulfite, he suggested varying the concentration of sodium metaborate within a range. Varying the alkali concentration is a fairly common recommendation for changes in contrast and speed. I have not found this to be a very effective control.
Thank you for the correction. I'm at work and apparently I had it switched in my head.

Quote Originally Posted by baachitraka View Post
...thats 8g, 12g and 20g for sodium metaborate for -N, N, +N
Thanks for that.