u/__nava__

Hi, could I please have some advice as it is the first time I will use a henna hair dye. On the picture is my current hair colour (the roots are natural, dull dark blonde, the copper part is from chemical dye).

I ordered a 113g Medium Brown Chestnut Rainbow Henna.
-Will this be enough for my hair length ?
-What would be the best thing to mix it with ?
-How long should I wait until applying it?
-How long should I leave it on my hair?

I’m hoping for a uniform result if possible, and not too dark or red.

Thanks in advance ☺️