Thanks Tethers. We got you sorted right out hey?
I think one of the main reasons Nice n Easy is so popular and successful is that they describe their colours as what they are "light golden natural brown" rather than "Havanna Moonlit Nights" complete with bullshit picture etc.
But once you are able to decode the international colouring system, it gets easier.
First there is your base. 2 is pretty much black, 3 very dark brown it may as well be black, 4 brown but still quite dark, 5 mid brown, 6 dark blonde (still perceived as brown to a normal eye), 7 deep mid blonde, 8 blondish, 9 blonde, 10 very blonde.
Then the other numbers mean a main tone and a reflect.
1 is green ash, 2 is violet ash, 3 is gold, 4 is copper, 5 is mahogany, 6 is red.
So if you have a 9.23, used with the correct peroxide, you will achieve a strawberry blonde on mousy hair.
Anyone wanting to be ginger needs aa 7.34 with at least 20 volume peroxide.
Etc etc.
Some of the blonde blends and ginger blends are simply not available as a box in the shop because idiots would put them on highlighted hair and wonder why they look like Ronald Chuffing McDonald. Etc.