From my experience, you'll need to add Indigo powder (木藍粉) to get a darker colour.
It's important to make sure the hair dyes do not contain any chemicals and is purely plant-based. Imagine how harmful it is to put chemcial dyes on your scalp and hair for 2 hours.
The method is like this :
1) dissoolve henna powder in water. let it stay for >12 hrs
2) before you dye your hair, add indigo powder and water to the henna paste and stir well.
3) wash your hair thoroughly (do not use 2 in 1 shampoo or conditioner).
As I know, Indigo powder is also one kind of CHEMICAL.
We are working in a dyeing factory before, they are using the Indigo Powder to dye the Fabric. Usually in DENIM, they are dyeing the Indigo colour.
If you have denim jeans, usually it is of Indigo dyed, after washing the indigo colour will fade out.
As I know, Indigo powder is also one kind of CHEMICAL.
We are working in a dyeing factory before, they are using the Indigo Powder to dye the Fabric. Usually in DENIM, they are dyeing the Indigo c ...