SWIM is interested in shelf life of home made NaEtSO
4, when stored in a tightly sealed glass container. He doesn't want it to go bad, because he is not planning to turn it to nitroethane immediately. NaEtSO
4 was prepared by the method described by Bandil in
Post 251119 (https://www.thevespiary.org/talk/index.php?topic=11878.msg25111900#msg25111900)
(Bandil: "Nitroethane ala Antoncho succes", Novel Discourse).