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.

Metal In Jewelry That Leaves A Green Stain - Underground Worlds CodyCross Answers | CodyCross Solutions