Following on from my post on undertones, here are some more examples of the differences between warm and cool undertones of colours.
When picking undertones, you want to look at what the colour is made of, as if you were painting it, and think about what colours you’d mix together to create it. If you’re adding yellow to a colour, you’re warming it up. If it needs some blue, you’re cooling it down, though with purples, adding red warms it up, adding blue cools it down. As you can see with the following pictures, whether the colours are lighter, darker, brighter or more muted, you can still have warm or cool undertones.
Light colours with white added are called tints
Next: undertones of shades