Yellow can be cheerful and it motivates you but some people find it tiring or annoying.

Green and blue are the colours of harmony. They actually help to lower blood pressure.

The very bright colours like yellow, orange, red are used to warn and attract.

Around the World, colours have different ideas, emotions and events.

Mostly warning signs are red, yellow, black and white. 

Chinese believe that red brings good luck. They wear red on their wedding day.

White is a universal symbol of peace, but in China and Japan it means death.

Blue stands for love but it also mean heartbreak.

Some informations about the rainbows:

The rainbow has seven basic colours. These are red, blue, green, purple, pink, orange and yellow. Everybody knows the theory which is about that in the end of every rainbow we can find a goblin with a lot of gold. But until yet no one could prove it.