
Indigo
Color Qualifier
Indigo refers to a specific shade of blue, darker than sky blue but lighter than navy.

She wanted an indigo dress to match the twilight sky.
Color Metaphor
Indigo is often used to suggest depth and richness in literature and poetry.

His indigo moods were reflective of the stormy seas.
Compare with
AzureBlueCobaltMidnightNavyRoyalSapphireSkyUltramarine
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