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All answers having "Shade of gray" as clue:

3 Character Answers:

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ASH

ZIN



4 Character Answers:

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DOVE

IRON

MOLE

OPAL

ZINC



5 Character Answers:

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AGATE

PEARL

SLATE

STEEL

TAUPE



8 Character Answers:

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CHARCOAL



10 Character Answers:

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BATTLESHIP



11 Character Answers:

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VIENNASMOKE