If you are looking for an easy and effective hair dye to color your hair black, Black Diamond Black Henna is the right choice. Also Known as Black Diamond Kali Mehandi, the Brand is popular across the country. It’s a herbal based product and provides natural conditioning to hair. Black Diamond Kali Mehandi is ammonia free and contains no harmful chemicals. It is easy to use, just add water to the powder and your paste is ready.