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Explanation: When used to describe colors, "midnight" usually means "deep blackish," for example, Webster dictionary defines "midnight blue" as "deep blackish blue." The original text you provided uses a "palette of midnight darks" so it refers to an array of deep dark colors like deep blue, deep brown, etc. "深黑色调 (的颜色）“ should fit here.
chenarth Local time: 08:44 Native speaker of: Chinese PRO pts in category: 4