Blue is a secondary color, which means it is made by combining two primary colors. The two primary colors that are mixed together to make blue are often surprising, as they are red and green. When red and green are combined in the right proportions, they create the rich and vibrant color of blue.
Color theory is used to describe colors using three attributes, hue, saturation, and brightness. Hue refers to the actual color of a shade, while saturation refers to how intense that color appears. Brightness refers to how light or dark the color appears.
When red and green are combined in equal amounts, they produce a neutral color that looks gray or brown. But when more green is added to the mixture, the result becomes cooler and more blue-green in hue. On the other hand, adding more red makes the mixture warmer and more magenta in hue.
The exact amount of red and green required to produce blue depends on the specific shade of blue needed. A lighter shade of blue requires more green, while a darker shade may require more red. The brightness and saturation of blue can also be changed by adjusting the amounts of red and green in the mixture.
It is worth mentioning that there are other methods for creating blue, such as in the additive color model used by electronic devices like TVs and computer monitors. In this model, blue is produced by combining red, green, and blue light.
In conclusion, red and green are the two primary colors mixed to make blue, despite the common association of red and green with warm and cool colors, respectively. The proper combination of red and green can create a broad range of blues, from pale and cool to deep and rich shades.