Purple
Diverse interpretations are associated with purple. Purple gives mixed messages. Historically, of course, the purple denoted royalty and grandeur. But this colour is also associated with illness. To symbolise vomiting and other forms of sickness some people wear head band of purple colour.

Red
It increases the appetite. Some expensive restaurants use red table cloths and napkins to increase the appetite by raising the metabolic rate. People on the weight-control programme i.e. slimming, should stay away from red decorated restaurants, tomato sauce and sliced water melon.

Blue
Conversely people refuse to eat blue tinted foods. People have a natural aversion to eating something blue. Weight-loss programmes are more successful, when foods are eaten while looking at blue decoration.

Yellow
According to latest researches yellow stimulates anxiety and is the most irritating colour to the retina of people over fifty. It increases blood-pressure within thirty seconds.

Black
It brings on a feeling of depression in forty-five seconds. Having the knowledge of these colour phenomena, we can easily understand how to influence other people and how, in turn, advertisers, mercantile companies, marketers and industrialists sway us in our direction of thinking and buying habits.