I spray lots into the top so that fog billows out and then get some more onto the inside neck of the bottle - it will form a little icy crust. Put the cap on and the bottle will inflate to fairly high pressure. At that point the butane has displaced (I'm guessing) maybe 3/4 of the oxygen/nitrogen mix. Place your hand on the bottle to warm it (evaporate that little crust) and the pressure will shoot up to several atmospheres (about 105psig = 8bar absolute). Now you release the pressure from the lid gently so that it comes down to just over 1 atm, and that will release 7/8 of the remaining oxygen. What remains is about 1/32 of what was in there before.
I live quite close to a Fuji minilab in southern Sydney. They have survived, and thrived after so many minilabs have gone out of business. They supply a complete service to amateurs as well as the commercial wedding photographers. They process 35mm, 120 and print on Fuji machines as well as having a full digital kiosk for self service. Also, a lot of their work is handled through their website.
Their quality is fantastic - all printing is fully colour corrected, and customers generally always return after seeing the results of the 'cheap 9 cent prints' from the large chain stores.
I help them out with traditional black and white film processing (which is becoming more popular with some of their customers) which is then prinnted digitally.
About the C-41 (and any other chemical process) solution storage - try wine cask bladders (the foil type, not the cheaper clear plastic types) - they can be washed and filled to the spout so oxidation is no problem. I have kept black and white film and paper developers for around two years is wine casks...they're great!
well dont keep us in suspense? where is this fuji wonderland?? ;) im in southern sydney and if you didnt know there is also http://www.rgphotography.com.au/index.html
who do 35mm 120 in b and w c41 and e6! his prices are also reasonable, so definately check em out!
my local Big W [Morwell, Vic] stopped as well.
i dont shoot much 35mm c-41, but when i did, it was handy!
Just got another film processed at Roydhouse Cameras, and it was not cut and sleeved. It was just rolled up and put in a zip-loc bag, and not cut. It also had scratches this time! I guess I have to start sending out my C41 now.
Just to add,
the local Big W where I go (Kingston, just outside of hobart) still does C-41.
It costs about $4.95 for a roll of 36 sleeved. The film comes out decent but there is normaly a few scratches on the end and it's not super clean.
When I got a roll done on my PEN-EE half frame they told me my camera was broken because it was only giving half shots!.