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Reference.org
Formazan
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<p>The formazans are compounds of the general formula [R-N=N-C(R')=N-NH-R"], formally derivatives of formazan [H2NN=CHN=NH], unknown in free form. </p><p>Formazan dyes are artificial <a href="/facts/Chromogen/gk53acQN">chromogenic</a> products obtained by reduction of tetrazolium salts by <a href="/facts/Dehydrogenase/hX7eulAz">dehydrogenases</a> and <a href="/facts/Reductase/R7ozNahQ">reductases</a>. They have a variety of colors from dark blue to deep red to orange, depending on the original tetrazolium salt used as the substrate for the reaction. </p>