Hey yall. So I ordered some henna and amla to dye my waist length hair with. I have already done strand tests, but I am wondering how much I need for my waist length (when stretched) hair. I have 500 grams of dye total (amla included). Should I mix it all or just 400 grams?

3a/b low to normal porosity curls
CG method since 2006 @:-)
CO wash: suave naturals coconut
rinse out CO: GVP conditioning balm
stylers: KCNT, CK, jessicurl spiralicious
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Blog: Curls and Blossoms