Consult the “before” and “after” images, as well as the product names, on the package to identify the hair concealer closest to your hair colour.
 
You should start by referencing the lightest part of your hair colour that you want to match as the starting point for selecting the shade, and this should match the lightest colour in the compact. Then ensure the darker shade is a close match to your darker shades.
 
Please note that for some colour combinations, it may not be possible to match blends of hair colour with a single dual-shade compact.