This is the 5375th most frequent Russian word.
оттенок
Shade, hue, or nuance.
оттенок is used here to mean 'shade' or 'subtle hue' when describing the color.
На улице ясно и солнечно, но у неба есть лёгкий оттенок синего.
It's clear and sunny outside, but the sky has a slight shade of blue.
оттенок is used figuratively here to refer to a nuance or subtle quality of character in her voice.
Её голос имел тёплый оттенок заботы и нежности.
Her voice had a warm touch of care and tenderness.
оттенок is used here to refer to a specific variation or type of paint color.