Psychology of colours

Since the day human became able to manufacture the paint the start using the colours as the coded language of information. Nowadays such phenomena not as frequent as it were for some centuries later. For example first tribes that couldn't write recordered their history as rock paintings. The researches concerned those rock paintings proved that information contains not only in the images painted on the rock but also in the colours of those images. Three colours were used by that tribe: white, red and black. The reason why only those three colours were used is not the easiness of their manufacturing but the emotions and feeling connected with them.
For example white colour was a colour of welfare and calmness of the things and this colour had no single negative meaning. So, women in those rock paintings were of white colour. The red colour was a symbol of aggression and fight, so warriors of the tribe were painted as red-colour figures. The black colour was a colour of the danger and the colour of the figures of wild animals or natural hazards. There was no person to tell those people about the meaning of one or another colour and if so, those colours were chosen on the feeling and emotions of the tribe-members strictly.
So, according to this information the conclusion may be drawn that the meanings of the colours are recordered in certain books as a result of psychological researches. If so, the colours are able to provoke in one's mind certain emotions and feeling and, maybe, stimulate certain activity. Emotions, the colours provoke in us, are greatly reflected in our speech. For example there is a characteristic of person "blue", it doesn't mean that person has a blue face or something; it means that person is sad and frustrated. Upon this we may state that blue colour is associated in our mind with negative emotions and sad feelings.
There is also such expression as "green with envy" means that person extremely envious. So, green colour has a negative aspect in our minds, it is associated to evil, petty and envious person. So, if you want to make a present for your friend, don't wrap it with green paper. Another expression that concerns the feeling of anger "red with anger", means that person is extremely mad about someone. According to this expression one may state that red colour provokes the feeling of aggression and furiousness, so one should better not paint the walls of the bad-room or office with red paint. In counter, red colour is perfect for gymnasiums, as it provokes the aggressive energy necessary for competitions. The expression "grey with shock" means that person who underwent some stress gets grey, as so, grey may be considered as the colour of weakness and helplessness.