black, dark
黯 centers on deep, somber darkness: a blackness that feels heavy or gloomy. The given meanings 'black' and 'dark' both point to this same core idea of lightless, shadowed quality.
黯 combines 黑 (black) with 音 (sound), likely to express a dark, gloomy quality associated with deep or muffled sound. The exact historical development is uncertain, but the phono-semantic structure is plausible.
The left side 黑 is blackness, and the right side 音 is sound. Imagine a dark, silent room where even sound seems swallowed by the deep blackness—黯 is that heavy, gloomy dark.
For アン, picture an unlit room so dark you can't see your own hand: 'un' as in 'unseen' cues アン, and the blackness of 黯 makes everything unseen.