And very quickly, the answer comes that nature doesn't use paint. And you realize that a peacock feather is brown. That colour is caused by layers of simple keratin. Your fingernails are made of keratin. Layers are laid down at 90-degree angles, and the light which is bouncing through them and bending back out, creates the colour.
Nature uses a free energy source, light, and lays it down.
Then you'd get away from the question of which paint is the best to use. That's what businesses are so excited about. Today, even our supercomputers can only execute a trillion operations per second, and every product we make increases the toxicity of the air we breathe, the water we drink and the food we eat. At one point in her search, she took a summer off, sat down and read textbooks so she could speak to the multidisciplined scientists in their own language. When she emerged she found thousands of them, many working independently and publishing only in obscure technical journals.