Answers

2016-01-29T23:03:47+05:30
It's not a pigment really, it is the violet coloured Ray, one of the seven coloured Rays of the white light.
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2016-01-30T00:04:08+05:30
No pigment but the scattering of blue light (least wavelength) by the particles present in the atmosphere give us an appearance of sky being blue.
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