That light is already blue! That son of satan is trying to deceive us !
Has nobody told you?
All the seven (yes, it's just an arbitrary number) colours of the rainbow,
red, orange, yellow, green, blue, indigo and violet
are all components of the white light from the sun.
So, sorry no Indigo or Violet colours available.
Here you can go and read up on it in
What Wavelength Goes With a Color?This, taken from that article, gives the wavelengths of the various colours:
Violet Light
The visible violet light has a wavelength of about 400 nm. Within the visible wavelength spectrum, violet and blue wavelengths are scattered more efficiently than other wavelengths. The sky looks blue, not violet, because our eyes are more sensitive to blue light (the sun also emits more energy as blue light than as violet). | | |
Indigo Light
The visible indigo light has a wavelength of about 445 nm. | | |
Blue Light
The visible blue light has a wavelength of about 475 nm. Because the blue wavelengths are shorter in the visible spectrum, they are scattered more efficiently by the molecules in the atmosphere. This causes the sky to appear blue during the main part of the day, when blue light is scattered into your eye no matter which direction you look. | |  |
Green Light
The visible green light has a wavelength of about 510 nm. Grass, for example, appears green because all of the colors in the visible part of the spectrum are absorbed into the leaves of the grass except green. Green is reflected, therefore grass appears green. | |  |
Yellow Light
The visible yellow light has a wavelength of about 570 nm. | |  |
Orange Light
The visible orange light has a wavelength of about 590 nm. Low-pressure sodium lamps, like those used in some parking lots, emit a orange-ish (wavelength 589 nm) light. | | |
Red Light
The visible red light has a wavelength of about 650 nm. At sunrise and sunset, the light you see has traveled a longer distance through the atmosphere. A large amount of blue and violet light has been removed as a result of scattering and the longwave colors, such as red and orange, are more readily seen. | |  |
If the atmosphere were perfectly transparent the sky would look simply the "black of space" and we would see the stars and planets in the daytime (as long as the sun was not too close to dazzle our eyes).
We see the sky approaching that when at very high altitude, as in this photo from an aicraft window:
And the blue of the sky is caused by "Rayleigh Scattering", scattering the blue and shorter wavelengths from sunlight down to us.
There now, Mr İntikam, that is the true answer to the question
Why The Sky Is Blue?