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light and shade; shade (of colour, color)
depth (of flavor); complexity; strength and weakness (of flavor)
水彩画の繊細な色の濃淡が美しい。
The delicate gradations of color in the watercolor painting are beautiful.
先生が墨の濃淡で表現する技法を教えた。
The teacher demonstrated the technique of expressing with ink gradations.
カーテンは、光の濃淡で部屋の雰囲気を変える。
The curtains change the room's atmosphere with their light and shade.