Hello

I see a lot of formulas for developers I mean in terms of dilution, I initially thought that it is primarily for saving on developer. However, while I was looking for different films to buy on the internet, some films had instructions like "for better tonal values use 1+4 or 1+10 etc. etc."

I want to know does dilution affects how the film is finally developed, is there any science behind it?

Cheers
Raffay