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All answers having "Pigment" as clue:

3 Character Answers:

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DYE

HUE

RED

TOW



4 Character Answers:

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MING



5 Character Answers:

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COLOR

HORSE

OCHER

OCHRE

PAINT

STAIN

TONER

UMBER



6 Character Answers:

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SIENNA



7 Character Answers:

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MELANIN

STAINER



8 Character Answers:

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COLORANT

CONSTRUE



10 Character Answers:

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COBALTBLUE