Today's video I'm gonna talk about black-and-white mix.

If you're in the basic tab of lightroom and you want to change the image into black and white click where it says black and white.

When you do that the colors tab (HSL) turns into the black and white tab and we could then take the slides and change the corresponding colors luminance values.
For example, blue I could move it right or left to make it lighter or darker.

Let's say you're not sure of what color is, you could use the targeted adjustment tool:

Just click on it to activate it, go over the color you want to change, click with the left mouse button and drag down to make it darker to make it lighter.