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Updated: July 18, 2026
Just suppose two ammonia groups, NH and NH . If we rob those nitrogen atoms of their hydrogen atoms, we should leave two unsatisfied nitrogen atoms, atoms with an exceedingly keen appetite represented in terms of hydrogen atoms as N * and N *. We might suppose a group, though of two N atoms partially satisfied by partial union with each other, thus N:N . Now this group forms the nucleus of the azo-colours, and if we satisfy a nitrogen at one side with an aniline, and at the other with a phenol, or at both ends with anilines, and so on, we get azo-dyes produced.
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