Metal in Jewelry That Leaves a Green Stain
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2168, Puzzle 5 (Moaning Caverns).
Question is: Metal in Jewelry That Leaves a Green Stain
and the answer is: NICKEL
Word Meaning:
NICKEL — (uncountable) A silvery elemental metal with an atomic number of 28 and symbol Ni.
Definitions from Wiktionary.