1. Raman Effect
If you have studied a little physics, when thinking of blue, immediately you should think about the Noble prize winner scientist C V Raman who received the Nobel prize for his invention called Raman Effect - "why do the sky and still deep water appear blue in color". He invented the reasoning for the same as scattering of sunlight for the above using very simple apparatus.

2. Once in a Blue Moon
Everybody knows there is no Blue Moon, then what is this? This is also an idiom, like " Black Sheep", meaning "very rarely". When I first read this idiom, I never thought that how it is related with Moon. Later I knew that once in 15 or 16 years, when there are two Full Moon days in the same month, it was called "One in a Blue Moon". Since it happened in a very long time, the 2nd Full Moon in the same month was termed as Blue Moon.

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6. Blue, The Universal Ink
Although in court black ink is used, but normally people use blue ink in day-to-day writing. All use this color ink in fountain pen or ball point pen as universal ink now. A slight variation of blue is the violet ink. Long before in 1950s, it was blue-black when ball point pens were not in fashion and one had to buy the ink bottle for their pens and fountain pens. There used to be "Waterman's" ink in fou colors - blue-black, royal blue, green and red. Later Sulekha replaced this company. It was making violet ink too. The teachers however barred using violet ink during examinations.

7. Blue Ball
Blue ball is the name of the pain some times occurs in males in the testicles area.

8. Blue (Neel) and Whiteness of Clothes
In earlier days his blue was available as a powder packed in packets. This powder is used to bring whiteness on white clothes. For this a small quantity of blue is mixed in water and in it white cloths were well dipped, squeezed and dried. Now-a-days Many people have started painting their houses, but some years before, say in 1950s, whitewashing was the only means to paint houses before Deepaavalee. To bring the crisp whiteness in whitewashing people used to mix the same blue was with lime with whitewashing. Now whitewash has become a dictionary word. Walls are painted now. This blue powder is replaced by blue liquid. A few drops are mixed to water and cloths are dipped, squeezed and dried. White cloths after drying in sunshine become excellent white.

9. Shankhu Pushp
The flower blue Shankhu Pushp used in the temples in southern India. Neel Kamal is very famous blue colored lotus flower. Before crossing the sea to go to Lankaa, Raam worshipped Devee with the desire of victory over Raavan. After the sacrifice He had to offer 100 Neel Kamal to her. Nee Kamal were collected, but when they were counted they were only 99. There was no time to get one more, so Raam thought that His eyes are said like Neel Kamal, so He thought to take out one of His eyes and offer it to her. As He was about to do so, Devee pleased with His offering appeared before Him and blessed Him for His victory.

10. Human Body and Blue
The nerve through which blood passes is blue in color. In some people the nerves can be seen close to outer skin and we can view them as blue; Some people have blue eyes. In western countries it is more common than in India. The human body becomes of blue color by the poisonous effect mostly if any snake has bitten it. Immediately he has to be rushed to hospital to save his life.

11. Blue Tooth Technology
Now-a-days Blue Tooth technology is very common. By this technology, one wears a small wire-like thing on his ear. This wire-like thing is called Blue Tooth. It has a microphone and a place to hear. So with this thing on his ear one can talk and hear as one is talking with a phone. With this on, one need not to pick up the phone receive and be tied to it. First there was ordinary telephone and one had to be near the telephone to use it; then came the remote telephones where one could take the receiver from its docking station (where it was kept when not in use and got charged because it ran on battery); and now this Blue Tooth technology by which you need not to touch your receiver any more and since it is worn on an ear, one's both hands are free to do any thing. It is good if you are driving, or writing or want to write something while talking etc.

12. Saturn and Blue
In Astrology blue is the color liked by Saturn. Whenever any problems from Saturn are faced by a person, he is advised to wear blue cloths and donate blue cloths and wear blue sapphire. Sapphire is the blue diamond. There was a theater in Chennai on Mount Road by name Safire.

13. Places and Names
There are Neeleswaram and Neeli. However Neeli name is rare now a day. But Neelakanth Iyer and Neelakantan Nairs are there. Many times Neelakantan has been shortened by us as Neelantan. In northern India, Neela, Neelima, Neelu as girls' names, Neelkant, Neelmani etc boy's names are common.

14. Blue Color in Religious Ceremonies
Blue color (except Blue Sapphire) is regarded as inauspicious color in all religious and ceremonial ceremonies in northern India. Nobody wears blue, black, violet, and brown colors at the time of marriage or other religious auspicious ceremonies or time. Yellow, orange, red, and green colors are preferred at that time.