Now i have developed 4 films in my initial 350ml batch of this soup, now 8 weeks old and stored in just a little more than half full bottles. Today i developed a roll of Reala and it came out OK. So, the working solution seem so far to last more than 8 weeks in room temp even with a lot of air in the bottles, and the concentrates lasts for a very very long time and do not need to be stored in full bottles or use of protectan gas or such. It can also be bought in very small quantities, even kits down to 500ml working solution. This chemistry looks to me more and more like the perfect fit for the hobbyist.