Monbair indigo and henna powder You can use for colouring the hair to get your desired hue of hair colour Indigo can be applied in one step or two step process to get different tones such as Black Brown dark brown etc. It gives natural and attractive color to hair without any chemicals. Indigo dispels heat and have a soothing effect and revitalizes the hair. Treat your hair with Indigo. After rinsing your hair let it dry. Mix Monbair Indigo Powder in warm water to prepare a paste. Apply on your hair using gloves if applying with your hands or a spatula. Leave on for 45 minutes or more depending on preferred intensity. Itâs advisable to keep it on hair for up to 2 hours to get rich black color. Rinse thoroughly with water. Wash your hair with a cleansing shampoo the next day.