According to you, what you want to cook is black rice/black beans, right? If it is brown rice or beans, the score of 5- 10 is not cooked. I suggest you soak in water for a few hours before cooking, and hot water is better. Drain the soaked beans and put them in the pot together. Boiling powder should take 20-30 minutes.

If it is ground into powder by a mill, wait until the water boils before putting it down for cooking. 5- 10 minutes is enough. It's paste, not powdery.