Gray Shade of Blue, Named After an Alloy

This page is the CodyCross answer for the clue below from Fruits and Vegetables, Group 1911, Puzzle 3 (Blueberries).

Question is: Gray Shade of Blue, Named After an Alloy

and the answer is: STEELY

Word Meaning:

STEELY — Having qualities resembling those of steel, especially hardness and resoluteness.

Definitions from Wiktionary.