Crossword Clue:

CYANINE a blue dye also CYANIN

AnswerCrossword Clue
METHYL... blue (a basic dye)
WOADBlue dye from a plant.
ANILShrub yielding a blue dye
ANILBlue dye from a plant
ANILSource of a blue dye.
INDIGOSPlants that yield a blue dye