Your Natural Hair Colour (Regrowth Colour) will fall between 1 (the Darkest) and 10 (the Lightest).
Match your Regrowth to the closest Natural Hair Colour swatch, remembering the Colour number.
1 Black
2 Brown / Black
3 Dark Brown
4 Medium Brown
5 Light Brown
6 Dark Blonde
7 Medium Blonde
8 Light Blonde
9 Very Light Blonde
10 Lightest Blonde
Grey Hair
Once you've determined your Natural Hair Colour move onto Step 3.