Copperas

Definitions

1. Iron(II) sulfate.
   uncountable, usually
2. An obsolete sulphate compound with one of the three metals, zinc, copper or iron.
   uncountable, usually

Equivalents

Examples

“It were superfluous to describe⟳ the Process⟳ of making the Aqua fortis; it shall suffice to let⟳ you know⟳, that our common Coperas makes this Aquafortis well enough for our purpose[…]”

“[…] what a change⟳ has introduced itself everywhere into human affairs! How human affairs shall now circulate everywhere not healthy life-blood in them, but, as it were, a detestable copperas banker’s ink;”

CEFR level