What is a shade darker than mocha brown garnier nutrisse?

[Firsttimemummy19]

I've been using no 5 mocha brown from Garnier Nutrisse but it's not quite dark enough. What is a shade darker?

The lower the number at the start the darker the colour e.g. 1 is black and 10 is lightest blonde. Number 4 would be darker than the 5 you have been using