The rainbow's colors are red, orange, yellow, green, blue, indigo, and violet. Indigo is the deep blue color at the end of the spectrum; it can't be seen with the naked eye. It's made up of a mixture of blue and white light.
Indigo was first discovered by the Chinese around ad 500. They called it "indigo bird" because of its bright blue color. Today, we know it as indigo dye. The ancient Greeks and Romans also knew about this color, which is why they painted clouds with it in their art.
In science, indigo is used to make fibers for clothing and rope. It is also used in medicine to stain blood cells that look under a microscope.
Indigo has many names including Indian blue, Egyptian blue, and German blue. It is found in nature along with other indigo dyes - indigotin (red), indoxyl (yellow), and methyl indoxyl (white).
People have been making indigo from plants since prehistoric times. It takes about three years for Indigofera tinctoria, or madder, to produce indigo.
This color sequence creates the recognizable pattern that we all know and remember from infancy thanks to the usage of mnemonic words. These are remembered as ROY G BV because they are ordered by wavelength: red, orange, yellow, green, blue, indigo, and violet.
Color psychology is a field of study that investigates how our perception of color affects our emotions and behavior. There are many theories about which colors best represent different qualities based on their position in the spectrum and other factors. However, no one can deny that the rainbow has a powerful effect on us. It is common knowledge that when you see the entire string of colors in the right order, you will remember them later in life.
There are many stories about people who saw the rainbow and then went on to achieve great things. This may be because colors have an impact on our moods and emotions, so seeing the rainbow make us feel happy and hopeful. Alternatively, it could be that people remember these colors later in life when they need inspiration or motivation to accomplish something great!
The true reason why we remember this string of colors in the order listed above is still a mystery.
The rainbow's band of colors is known as the spectrum. As signified by VIBGYOR, these colors occur in the following order: violet, indigo, blue, green, yellow, orange, and red.
The visible light region of the electromagnetic spectrum contains the seven hues of the rainbow (red, orange, yellow, green, blue, indigo, and violet). It has been estimated that visible light accounts for less than 1% of all visible light. It is predicted to account about 0035 percent of the whole electromagnetic spectrum. The other 99+% is made up of radiation in the infrared and radio wavelengths.
Visible light is made up of waves with frequencies from about 390 to 770 nanometers. This range is called the "visual range" because humans can see light between 400 and 700 nm. Above 700 nm, water starts to absorb these waves; below 400 nm, objects start to emit heat rather than light.
Radiation in the infrared range has longer wavelength waves than those in the visual range but is still within the visible spectrum. Infrared rays are able to pass through solid objects such as windows and leaves without being absorbed, so they are useful for seeing inside buildings and vehicles at night. Objects that emit thermal energy (heat) have wavelengths between 3 mm and 30 µm. Emissions at this range are called thermal radiation.
Radio waves have even longer wavelength waves than infrared or visual light and are outside of the visible spectrum. Radio waves are used for communication via antennas, which allow people to send and receive messages over long distances quickly. Some radios use microwaves instead.