Color mixer / HSL
The color mixer, also known as the HSL panel, lets you adjust hue, saturation and luminance per colour in Lightroom. So you can change just the blue of the sky or the greens in a landscape, without touching the rest. It's the panel for targeted colour correction.
You work per colour channel: red, orange, yellow, green, aqua, blue, purple and magenta. With the hue sliders you shift a colour, with saturation you make it stronger or weaker and with luminance lighter or darker. The targeted adjustment tool is very handy: click a colour in the photo and drag to adjust exactly that hue. Tip: skin tones live mainly in orange and yellow, that's where you subtly fine-tune nice skin.
Related terms
Prefer a look in one click?
The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.