Hair colour application is common these days because of the availability of them today almost everywhere. There are instances of premature greying and hair fall, more than that in the past owing to the high pollution in the cities, food contaminated with pesticides, chemicals and artificial colours, falling standards of nutrition, increased consumption of street food, etc. All these have led to skin and hair related disorders apart from ailments of other body parts. And, to top it all, there is this unstoppable trend of looking urbane, sophisticated and chic. Greying of hair is natural when one is on the wrong side of the fifty. But when one's hair turn grey right from the teenage, it becomes a matter of grave concern. One would like to do whatever in one's capacity to conceal the grey hair applying hair dyes and colours of various types to keep looking young. It opens up the possibility of damaging one's hair beyond repair. Sometimes, if the hair colour is spurious, it...