Copper __, Blue Fungicide Aka Roman Vitriol
This page is the CodyCross answer for the clue below from La Bella Roma, Group 413, Puzzle 5 (Herculaneum).
Question is: Copper __, Blue Fungicide Aka Roman Vitriol
and the answer is: SULFATE
Word Meaning:
SULFATE — (organic chemistry) Any salt or ester of sulfuric acid.
Definitions from Wiktionary.