Hey, I received a whole lot of old agfa brovira paper and I wanted to try them out and develop. Now my problem is I bought a packet of Kodak Professional Hypo Clearing Agent(502g/17.7oz) and have no clue how to mix it. I read on another thread here it is best to mix all of the powder, but then I would be stuck with 19litres/5gallon which I have to use within 3months or it wont be usable anymore. So I would just want to mix so I end up with 1L working solution. On the packet it says mix 15L water + 4L( I assume this is mixed with all powder in the package = 502g) to end up with 19L working solution. So is there a way to find the amount of powder(in gram) I have to mix with the amount of water to get 1L working solution. I would eternally grateful !