Mix equal parts of blue and brown rangoli powder
Mix blue, red, and a little yellow powder until a dark shade forms
Use charcoal powder if allowed and safe for your rangoli surface
Crush black sesame seeds finely and mix with rangoli powder for a dark tone
Mix dark blue with a small amount of red and green to deepen the shade
Add a little black food-safe color to white rangoli powder if using edible materials
Blend very dark grey powder with a small amount of blue or brown to make it look black
Use ready-made black rangoli powder for the most accurate result