The hair of many boys and girls start turning grey in the prime of their life. To improve looks. They start dyeing their hair. But riti, a class XII student, discussed with her teacher and class fellows that artificial dyes are harmful for health. instead, she suggested that natural dyes should be used. After reading the above passage, answer the following questions: (i) What type of compounds are present in artificial hair dyes and how do they product colour? (ii) What values are expressed by Riti? Name a natural dye.

The hair of many boys and girls start turning grey in the prime of the

1.	The hair of many boys and girls start turning grey in the prime of their life. To improve looks. They start dyeing their hair. But riti, a class XII student, discussed with her teacher and class fellows that artificial dyes are harmful for health. instead, she suggested that natural dyes should be used. After reading the above passage, answer the following questions: (i) What type of compounds are present in artificial hair dyes and how do they product colour? (ii) What values are expressed by Riti? Name a natural dye.
Answer» Solution :(i) Most of the hair dyes are derivatives of aromatic amines. P-Phenylenediamine itself produces a black colour while the p-aminodiphynylaminesulphonic acid is used in blonde formulation. Intermediate colours can be produced by using other derivatives. The colour of these dyes is due to their aerial oxidation to quinones and nitro compounds. (ii) riti has displayed CONCERN about the health of artificial hair dye users SINCE these are suspected to be carcinogens. THEREFORE, she SUGGESTED that natural dye Henna should be used. However, the active constitutent of Henna is not an aromatic amine but is a quinone actually 2-hydroxy-1,4-naphthoquione. .