Tom

Just because PQ in alcohol is very easy to mix and doesn't needs heathing.
I'v mixed 100cc of PQ (Patrick's staining formula) about 45 days ago, and it's clear in a half filled plastic bottle. And, the bottle does not collapses, indicating there is no oxygen absorption.

I add the alkali and sulfire when I mix the working solution (for film, borax of a stock solution, sulfite using spoon).
For paper, I intend to use spoon both for alkali and sulfite.

Jorge O