You could have found this thread in this very forum simply by putting "methylene sulfate" in the subject field :(
Post 258971 (https://www.thevespiary.org/talk/index.php?topic=11885.msg25897100#msg25897100)
(lugh: "Methylene Sulfate", Novel Discourse)
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000401290-file_1lgy.gif)