Henna and Indigo concerns about curls?

Hello! I am new here
and I am very curious about the whole henna and indigo process to dye hair. I've done a lot of research but still feel like I do not know enough to be convinced to try it without losing my curl pattern
I currently have a medium-darkish dull brown color. I want to get very dark brown, almost black color. So I figured I would try a 75% Indigo 25% Henna mix. However, even though I would be using more indigo, I am still concerned that I may lose my curl pattern. I have 2c/3a hair, and I don't want to lose those curls at all. I thought about mixing amla in with the henna to let it sit overnight, then mixing the indigo in the morning and mixing that with the henna/amla. Will this be effective and how much amla should I use? Should I mix more amla in right before mixing the indigo into the henna? Will this even prevent my hair from losing its curl at all?I'm so nervous! XD but I reaaaaaaaalllllly want dark hair, I just do not want to lose any curl at all. Plus I hear that indigo doesn't stick very well the first time so I would probably have to do this process every month or so until it finally sticks.
I am also not concerned about losing some of the red color by using amla. I would actually prefer there to be less redness anyway
I appreciate any help and advice, thank you!!


I am also not concerned about losing some of the red color by using amla. I would actually prefer there to be less redness anyway

I appreciate any help and advice, thank you!!
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Comments
I believe it's 1:3 amla to henna ratio to prevent curl loss.
Amla tones down the red in the henna, but only in the presence of indigo.
Curl loss tends to happen to fine hair and wavy hair.
Henna and Indigo are both drying to the hair. If you don't have something moisturizing, like coconut milk for example, in your mix, you should almost certainly deep condition afterwards.
If you're concerned about curl loss, there are two things you could try. One is just using a tiny amount of henna in with mostly amla and see what happens. I did that for awhile and eventually I did get way too much henna in my hair. It's strong stuff. Another thing you can do is use cassia, so called neutral henna (though it will turn grey light blonde). It is similar to henna but not as strong and not permanent. If that straightens your hair, then so would henna. If it doesn't, henna still could but it would at least give you some idea about how your hair responds to these herbal treatments.
I'm hesitant to try henna again due to potential curl loss, too. If you try it let us know what you do and how it ends up working out!
3A/f/i
Super baby fine hair, low porosity
Shampoos: SM Fruit Fusion (mostly), Avalon lemon (to clarify). Occasional aloe vera and glycerin to wash.
Stylers: Intelligent Nutrients Perfect Hold Hairspray
Treatments: Catnip tea, IA girl's PT, Fermented Rice Water, Catnip Tea, Amla tea, Irish Moss, SS PT
Yeah, I hear ya on the fear of curl loss. My advice, FWIW; start with a minute amount of henna. I made my mix mostly amla with just a drop of henna. If you notice no effect, then at least you know your hair can tolerate a little of it.
3A/f/i
Super baby fine hair, low porosity
Shampoos: SM Fruit Fusion (mostly), Avalon lemon (to clarify). Occasional aloe vera and glycerin to wash.
Stylers: Intelligent Nutrients Perfect Hold Hairspray
Treatments: Catnip tea, IA girl's PT, Fermented Rice Water, Catnip Tea, Amla tea, Irish Moss, SS PT
3A/f/i
Super baby fine hair, low porosity
Shampoos: SM Fruit Fusion (mostly), Avalon lemon (to clarify). Occasional aloe vera and glycerin to wash.
Stylers: Intelligent Nutrients Perfect Hold Hairspray
Treatments: Catnip tea, IA girl's PT, Fermented Rice Water, Catnip Tea, Amla tea, Irish Moss, SS PT