I did my first henna glossing yesterday evening. I used:
3 tbs henna (Light mountain - mahogany)
3 tbs water
1.5 tbs acv
7.5 tbs (1,125 dl) conditioner (sunsilk winter mixed with olive oil)
I left it on my hair for 40min. I got a little more colour than I expected but that's ok. The babyhairs around my face turned rather orange but that was more or less expected since they normally are so light blonde you can hardly see them. My hair is very soft and shiny, even my ends wich have been kind of frizzy and strange for a while now. I don't know how much of this that comes from the henna and how much that comes from the 40min conditioning though. I guess I will see that after some days. Generally my deep conditionings last for about two or three days so if my hair feel great on the fourth day I it's the henna. 
1a/bFi
16/27.5/32/tailbone
Maria's Hair