I got a can of LPD powder today. The can is to make 1 gallon concentrate. i plan to dilute it 1:4 or 1:3 A few questions, sorry for some of them being dumb. - How long LPD stock keeps (in smaller airtight bottles)? - Would it make any difference if I make 1l stock (using 1/4th of the can contents)? instead of 1 gallon? - The can has to be opened with a can opener, I was planning to store the remainder in plastic (nalgene) wide mouth jars. - Does LPD work better using "old brown" method. i.e. 1/3 old developer + 2/3 fresh?