C41 developing

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Rodinal

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I have just developed my 1st colour film using the new 2.5l JOBO kit. Of all the kits I have used in the past 33 years of color printing and developing, this JOBO kit has given me the cleanest, brightest negatives I have seen for many years. They are a relatively new kid on the block with regard to chemicals and processing, but well known for their colour processing equipment. They have filled a welcome gap after Tetenal collapsed - yet again.
The processing times are slightly different with only the developing stage being the standard 3min 15 seconds. Pre rinse is 3 mins. Bleach is 7.5 mins, and fix only 4.5 min, otherwise it hasn't changed.
It has filled a nice hole in the chemical range we used to enjoy.
 
It is ages since I home processed colour but I have recently been contemplating the Bellini C41 1L kit, I would never get the through put to use a 2.5L kit.
 
Right from day one with colour film developing I have used 'use once and discard' method basically the throughput of colour films can be sporadic and better to use a new dilution for each film so the results are always consistent, however It doesn't actually save me money directly but I probably break even because the bigger the size of kit the cheaper it usually is!
If I were to buy a 1 litre kit which casts around £40 or so (Not JOBO because far as I know they don't make one)and used it to it's max I would get about 8- 10 films from it. (I have not checked) With the Jobo kit 2.5ltr kit and diluting the chemicals to make 150cc per film I get consistent results each and every time together with peace of mind
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The manufacturers give dire warnings of the shelf life of developer concentrates, but the one that will go 'off' quicker than the rest, is usually the one in the smallest bottle. The other two concentrates are very stable and will keep for a very long time. In the JOBO case, the one that goes off it is marked developer 'C' and it is in a 25cc glass screw-top bottle whereas the others are larger and made from plastic.

One little trick I learned early on, was to give extra protection against oxidisation by storing the bottles in which the concentrates that go off quickest are upside down! I don't know why, but it does seem work. I have also stored ready to use dilutions in glass screw top bottles filled almost to the brim and warmed them up to 38c then screwed the top on so when it cools down a slight vacuum is formed and hence less oxygen to make it 'go off'. That also works and have kept these dilutions for around a month with no change in colour or quality.
 
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I use the Bellini chemicals too - no problems so far. (y)
 
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My post no 3 above relates partially to life of chemicals. I wonder what would happen if I went the other way and diluted the whole kit in one go, then decanting the developer into 150cc bottles then put them in my deep freezer. I should probably not use glass bottles because the contents will expand when frozen and crack the glass, but as they will be deep frozen, oxygen probably cannot get to the contents in quantities that would make it go off. I don't think the chemicals that go up to make the developer concentrated are organic in origin, so they should be OK. Has anyone any thoughts on this.
 
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