Quoted By:
Two important rodinal updates:
1)It seems to corrode/destroy PET plastic, both pet containers I've kept it it became brittle/developed leaking cracks over time. Highly recommend storing in glass containers unless you use it up fast enough/transfer it to smaller containers as it depletes to avoid air oxidation. Pic related, bottom of my second container after 2 months.
2)A lot of crystal precipitate forms on the bottom - when I transferred it to two smaller containers I dissolved the crystals in some water and upon sticking a bit of exposed film in, it developed almost instantly.
p-aminophenol's solubility is 1.5g/100ml@25°C and we use a few grams of acetaminophen to begin with, so it seems the recipie gives a huge excess of our developing agent (possible future tweaking to use less paracetamol pills, cut costs) that just sloshes around uselessly on the bottom. I saved the dissolved precipitate solution to use as a paper developer (since we can't really properly quantify the sulphite and sodium hydroxide proportions anymore it might behave differently than the stock solution for reproducibility's sake, film-wise).
In the future may be feasible to collect precipitate and make up stock solution from already converted p-aminophenol via patented recipies rather than faffing about with pills - seems like a waste to discard the precipitate from each batch.
