Valence bond theory of dye chemical constitutions is the most important theory of color constitutions. The various postulates of this theory are as follows.

Valence bond theory postulates

Chromophores are teams of atoms. The electrons which get in transferring from ground  state to excited state by the absorption of radiation, manufacture the color. Auxochromesare teams tend to extend resonance by interacting the undivided combine of  electrons on gas or atoms of the auxochromes with the π electrons of the  aromatic ring. This increasing resonance will increase the intensity of absorption of sunshine and conjointly  shifts the optical phenomenon to longer wavelength. Then there happens the deepening of the  color. From this, it’s evident that increase in resonance should deepen the color and really it  has been found to be therefore.

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