for vip s welcome why should we use red colour carpet only..whynot the other colours.??

Answer 1

The Cambridge English dictionary states:
"The red carpet is a special official welcome that is given to an
important guest, esp. in which a long red floor covering is put down
for them to walk on.
We'll roll out the red carpet for the Senator.
The minister was given the red carpet treatment."

http://dictionary.cambridge.org/define.asp?key=red*1+10
_________

Online Etymology Dictionary has a short entry for red carpet, stating
that:

"...the custom for dignitaries is described as far back as Aeschylus
"Agamemnon"). "

http://www.geocities.com/etymonline/r2etym.htm
_______

A search on Aeschylus reveals that he lived 525-456 BC and that in one
play a wife laid out a red carpet as a welcome for a returning king.

http://www.methuen.co.uk/aeschylusplays2.html
_______

A short comment about the historical use of red and royalty is found
at the Institut National de la Langue Française. The use of red carpet
has now "trickled down" from royalty to visiting dignitaries,
ceremonies involving VIPs such as the Oscars and as you say, the term
has become synonomous with VIP treatment in general.

http://www.cnrs.fr/cw/en/pres/n391couleng/html/n391coula03.htm
_____

I also assume that a carpet would have provided a practical benefit in
past centuries when surfaces were more likely to be unsealed.

Search strategy:
"dictionary of idioms"
"red carpet" etymology

I

Answer 2

If you check out the history. Red has always been a Royal Colour. What colour do you imagine for the Robe of any King. Yes it is Red. Red is also scientifically mood aggressor. Which means it will enhance your mood. No matter what your mood is if your mood is good it makes you feel very good. This property of Red and it Royalty makes it an apt colour to welcome any VIP.

Answer 3

The very first ‘red carpet' welcome was probably the one offered by Clytemnestra to Agamemnon on his return from Troy in the Classical Greek play, ‘Agamemnon', by Aeschylus. It would probably have been more of a purplish crimson - the colour of the gods - but reddish, nevertheless.

Treading on the gods' colour would be a sort of sacrilege, which they would certainly avenge. Clytemnestra wanted to show him up as arrogant and deserving of the death she had planned for him for sacrificing their daughter earlier. So, this very early version of the tradition was not exactly ‘welcoming' after all!