Based on the given text, can you please. list some important aspects of colour theory

Context: According to traditional color theory based on subtractive primary colors and the RYB color model, yellow mixed with purple, orange mixed with blue, or red mixed with green produces an equivalent gray and are the painter's complementary colors. These contrasts form the basis of Chevreul's law of color contrast: colors that appear together will be altered as if mixed with the complementary color of the other color. A piece of yellow fabric placed on a blue background will appear tinted orange because orange is the complementary color to blue.
However, when complementary colors are chosen based on the definition by light mixture, they are not the same as the artists' primary colors. This discrepancy becomes important when color theory is applied across media. Digital color management uses a hue circle defined according to additive primary colors, as the colors in a computer monitor are additive mixtures of light, not subtractive mixtures of paints.

Answer: 1.	The painter's complementary colour based on subtractive primary colour and the RYB colour model, can be made by mixing yellow with purple, orange with blue, or red with green and it produces an equivalent gray.
2.	Since orange is complimentary colour of blue, A piece of yellow fabric placed on a blue background will appear as orange.
3.	When complementary colours are chosen based on the definition of light mixture, they are not the same as the primary colour.
4.	The digital colour management uses a hue circle of additive primary colour also known as the RGB colour model.
5.	The colorus in a computer monitor are additive mixtures of light.