Auburn is a very popular warm brow color used on the brow when a little red is requested and should be used on a person does not have red undertones. It is also a nice brown that can be mixed with lip colors.
Blue is a cool color that can be mixed with an eyeliner color.
Brown Black is a cool color used when a softer color than black is requested for eyeliner.
Coral is a very popular warm color. That is perfect by itself on the lips or used to mix with other colors like Mauve. When a warm color is requested mixing coral with auburn makes a very popular color.
Dark Ash is a cool color used for a brow color on a person that has red undertones and also can be used to help correct unwanted brow colors that have turned red.