Use of inert gases

[Duolab123]

Be careful....if the solution contains Sodium or Potassium hydroxide (1 to 10%) you can get problems, if the bottle is made of PET see "Polyethylene Terephthalate (PET)--Chemical Compatibility" https://roboworld.com/wp-content/upl...patibility.pdf
So far I have seen most e.g. developer solutions are made without NaOH or KOH but a few have it: For example Part B of "Pyrocatechin Compensating Formula" or "AGFA Rodinal - Original Version" with 20% concentration see http://www.danieldevinephotography.com/?p=4317

Bj68

I have used PET for XTOL no problem. E6 color developer, one of the 3 part concentrate DESTROYED the PET. I found a bottle of XTOL stock solution, I had in a PET soda bottle, I had squeezed out all the air. The bottle was 11 years old, just for fun I developed a roll of 120 HP5, worked perfectly!
I guess the lesson for me, if it's dilute, squeeze out the air. I use butane when I split chemistry, in Nalgene HDPE bottles.

Don't waste valuable Helium. It is a great Noble gas though.

[Axelwik]

You'll end up with carbonated chemicals with a lower pH due to carbonic acid.