Some years ago there was a long discussion on pure-silver about storing developers. Of the five most common materials used for bottles glass is the best followed by PET and PVC both rated as good and HDPE and LDPE were rated as poor. In my own experience HDPE and LDPE produced shorter life even with the air queezed out.
Interesting. I get 12 months out of my Xtol stock when stores in the accordion bottles I use, and six months out of LPD.
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