Excerpt from The Influence of Sulphur on the Color of Azo Dyes: Dissertation Submitted to the Board of University Studies of the Johns Hopkins University in Conformity With the Requirements for the Degree of Doctor of Philosophy
In this series the sulfur divides the molecules, so that the colors obtained appear as if each half were acting as a unit, while with benzidine the effect of each group is felt in the opposite ring.
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