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All answers having "Purple shade" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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PLUM

PUCE



5 Character Answers:

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GRAPE

LILAC

MAUVE



6 Character Answers:

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VIOLET



7 Character Answers:

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MAGENTA

PETUNIA



8 Character Answers:

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AMARANTH

LAVENDER