Deficiency of light results in blackness. Just as when there is light present (being the source of colors), it produces colors. Whereas gray, white and black are considered to be non-spectral colors. Since indigo is scientifically not recognized as a separate color, any wave having a wavelength of less than 450 nm is considered to be violet. The low range of the color explains why it is difficult to distinguish this color in the spectral band. In the above color spectrum chart, indigo is made a subset of violet color. The frequency of wavelength range for indigo is around 425-450 nm and frequency of 670-700 THz. Hence, it was suggested that indigo be dropped from the spectral chart and should be considered a shade of blue or violet. However, the frequency of the indigo color cannot be distinguished and recognized significantly by normal human eye, leaving the exception of some well-sighted people. This was concluded by Newton after he successfully carried out experiments to disseminate a beam of monochromatic light by projecting it onto a glass prism at a specific angle to display the spectral colors. In reality, there are seven colors in the color spectrum with the addition of indigo between blue and violet. The most prominently apparent ones are violet, blue, green, yellow, orange and red. However, the approximate ranges of wavelength and frequency can be used to specify the difference. Therefore, there are no definite boundaries between the colors. Spectral colors are generally produced by monochromatic light i.e. The scattered wavelengths are what see as colors. Colors form when light falls on different objects and reflects as well as scatters different wavelengths. It’s no wonder that the rainbow is often perceived as one of the most beautiful aspects of nature. Whether you are feeling blue after a hard day’s of work or going green with envy after seeing your neighbor’s fancy TV, the colors have become a language through which we express ourselves. Imagine the whole world in black and white color? Or picture the main plot of the movie Pleasantville if you have seen this flick? Just a mental image of a stark world devoid of colors is enough to reveal the importance of colors in our lives.
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