History of the coloring of the gray hairs can be traced back to Sumerians and Pharaohs 2000 BC. Women in the past used hair colors to hide their gray hairs. Today men are also applying hair color to hide their gray hairs and younger people color their hair as a fashion. The discovery of paraphenylenediamine and better understanding of chemistry of hair dyes have resulted in safe and customer friendly products. Now men and women can apply the hair dyes in their own home in just one easy step 30-45 minutes.