naphthamein

== English == === Etymology === From French naphtaméine. By surface analysis, naphth(a) +‎ -am +‎ -ein. === Noun === naphthamein (uncountable) A product formed by the oxidation of naphthalamine (also called naphthylamine), which was observed to produce blue precipitates that later became purple but that was considered useless as a commercial dyeing agent due to its poor color quality. === References === “naphthamein, n.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.