Kavuni Rice | Black Rice is in dark blackish-purple in color. It is an ancient variety of rice eaten only by the King’s family and forbidden for others. It is now cultivated organically and available for common people. It has high nutrients and is good for health. 2 What is Kavuni Rice | Black Rice? Karuppu Cavani rice (black rice) is commonly known by the name Emperor’s rice. It is also known as purple rice or Forbidden rice. The reason why this type of rice is called by royal terms is that it enriches health and ensures longevity. It is used to prepare varieties of desserts during ancient times.3. What are the benefits of karuppu Kavuni Rice? Organic Traditional karuppu kavuni black rice good source of Fiber. Kavuni black rice helps to prevent from Obesity. Kavuni kaikuthal black rice used to preventing Risk of Diabetes. Karupu kavuni arisi lowers the risk of type 2 Diabetes.