Red-green and yellow-blue are the so-called "forbidden colors." Composed of pairs of hues whose light frequencies automatically cancel each other out in the human eye, they're supposed to be impossible to see simultaneously. The limitation results from the way we perceive color in the first place.
Blue-yellow and red-green are examples of forbidden or impossible colors. These are colors the human eye can't see, yet the brain can perceive.
What we really need to know is that our eyes, in all their complexity, can only interpret a limited range of light. So, that means that there are colours that we can't see due to a phenomenon known as the opponent process. These are known as “forbidden” or “impossible” colours.
Red, yellow and blue are the primary colors. Primary colors are the most basic colors. You can't make them by mixing any other colors.
The three primary colors are red, yellow, and blue; they are the only colors that cannot be made by mixing two other colors. The three secondary colors are green, orange, and violet; they are each a mixture of two primary colors.
I thought it would be like brown or black. Then I asked him to repeat the experiment and we could again get the blue. Blue is the most difficult color to make, and we found it extremely stable, so that made me really excited, and we find this to be the first new blue pigment in 200 years."
Magenta doesn't exist because it has no wavelength; there's no place for it on the spectrum. The only reason we see it is because our brain doesn't like having green (magenta's complement) between purple and red, so it substitutes a new thing.
Red and green are called opponent colors because people normally cannot see redness and greenness simultaneously in a single color. The same is true for yellow and blue. Researchers have long regarded color opponency to be hardwired in the brain, completely forbidding perception of reddish green or yellowish blue.
Some consider white to be a color, because white light comprises all hues on the visible light spectrum. And many do consider black to be a color, because you combine other pigments to create it on paper. But in a technical sense, black and white are not colors, they're shades.
Black is the absence of the visible light spectrum wavelengths. Everything in a dark room appears black because there is no visible light to strike your eye as you gaze at the surrounding objects.
That's because it's impossible for the human brain to comprehend a colour not already present in our visible spectrum. (Bear with me!) As humans, we perceive the 3 primary colours (red, green, blue) which appear naturally in the environment. In our eyes, we have cone receptors.
Red has historically been portrayed as an alarm color to mark dangerous items, or to identify something as dangerous, explosive, or evil.
Chimerical Colors
The impossible colors reddish green and yellowish blue are imaginary colors that do not occur in the light spectrum. Another type of imaginary color is a chimerical color. A chimerical color is seen by looking at a color until the cone cells are fatigued and then looking at a different color.
Perhaps one of the most divisive of all, pink is a color whose meaning within society has changed more than any other. A color in constant transition, pink has taken on various guises across the world from the garb of Indian royalty to its place within UK punk.
Legendary is a soft, gray, millennial beige with a silvery undertone. It is a perfect paint color for a living room or exterior home.
Blue is one of the rarest of colors in nature. Even the few animals and plants that appear blue don't actually contain the color.
The rare colour is termed 'True Cyan'. An optical illusion that has got everybody hooked features a “never seen before” shade of Cyan appearing on the screen. The rare colour termed 'True Cyan' largely escapes the human eye due to the fact that it is extremely difficult for electronic devices to produce them.
According to the the opponent process theory, there is no color that could be described as a mixture of opponent colors. The same way you can't have a number that's both positive and negative, you can't have a color that's red-green or yellow-blue. These are impossible colors.
If it's invisible like Infrared or Ultraviolet, then it doesn't have any color. Even infrared can be sensed using another sensor such as camera, displayed on screen, and perceived as red color in our eyes. Is there any other color that we haven't discovered yet? None.
YInMn Blue (/jɪnmɪn/; for the chemical symbols Y for yttrium, In for indium, and Mn for manganese), also known as Oregon Blue or Mas Blue, is an inorganic blue pigment that was discovered by Mas Subramanian and his (then) graduate student, Andrew Smith, at Oregon State University in 2009.
Yellow and green are right in the middle of the spectrum's wavelengths. Our eyes are most sensitive to yellow and green, so they're the easiest colors for us to see, even when we're not looking directly at them.
Black causes feelings of intimidation and control. In certain contexts, can also seem sophisticated and sleek to its viewers. The website for photographer Marcin Kaniewski is a perfect example of using black (and white) to create the feeling of sophistication.