Red Chatouche attempt (hennè)

I got so tired of my current hair color so I wanted to attemp a new one. I wanted to try the chatouche. If you don't know what it is, it's a decoloration of your hair. They bleach your lower part of your hair and you get the two/three color effect. Right now I have dark red/purple hair, died with the hennè. If you don't know what that is, it's a plant and you can find it in powder form where you can dye your hair. You just mix it with hot water and apply it on your hair. This is the way I do it because it's natural and it doesn't ruin your hair, it actually helps it! So the problem with the hennè is that you can't dye your hair with the chemical way because it reacts with the hennè in your hair making it fall or turn green(?) (not sure of this tho) But, you can dye it if your dye is old! Anyway I wanted to attempt doing it with the hennè, dying the lower part of my hair a lighter red. So yesturday I tried it but it failed. I only applied it on the points, but you can't see the color difference, so I thought of dying my upper part (roots) black or a darker color. I'm not sure when I'll try doing it but will updat about it.
This is what I wanted to get:

I really love the chatouche on natural brown hair with blond chatouche.

But I wanted to do the purple one... I guess I'll have to try more times and hope it'll turn out fine....