I've been thinking of starting doing the developing part in my bathroom instead of the University's darkroom as I am doing currently. I have ordered most of the things I need and will find solutions for the rest of them. I use HC110 until now, for all of my developing and intend to keep it that way, so I can become familiar with the developer/films combination. I use dilution B straight from syrup [16 ml syrup & fill until the graduate reaches 500ml], although I am not sure if it's the "european version" or not I am using. I mostly mix 500 ml or a liter for developing film, and throw away after I'm done with all the films -- usually two or three, each film developed on it's own or in pairs. I develop at 20o c, and the results have been fairly consistent so far. What I want to ask is: how many films can I develop using 500 ml of this dilution or 1000 ml? I could try and find for myself, but will not for the obvious reason Do I have to make up for using it for more than one film somehow, like adding some time to the development of films after the first one? And lastly, are plastic bottles OK for the storage of HC110 if the air is taken out of them? Thanks, -Sino.