The 1:1:100 is for general silver printing (enlargements) while 2:2:100 is for contact printing.
Yes, that is the basic reasoning. Contact priting with AZO and alternative processes requires negatives of much greater CI than silver printing. I wanted to normalize time of development and found by trial and error that this could be done for the two types of processes by changing dilution.
In other words, a 1:1:100 dilution at 10 minutes will give a similar CI as 2:2:100 at about 6 minutes.
Use the dilution that gives the most convenient time for your conditions.
Last edited by sanking; 09-06-2006 at 06:04 PM. Click to view previous post history.