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
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