Post 356265 (https://www.thevespiary.org/talk/index.php?topic=9480.msg35626500#msg35626500)
(Barium: "Oxime formation", Methods Discourse) andPost 356287 (https://www.thevespiary.org/talk/index.php?topic=9480.msg35628700#msg35628700)
(Chromic: "Clarifications on Sonson's method", Methods Discourse)