2. Specific combinations and relative concentrations of nitrosatable species and coupling reagents.3. Reaction of nitrite with ring substituents other than the amino group.4. Reaction of nitrite with the coupling reagent. 5. Formation of more than one pigment. 6. Oxidation of the diazonium ion intermediate. 7. Oxidation of the pigment. 8. Oxides of nitrogen in the air. 9. Reduction of the diazonium ion by residual reductants. 10. Formation of semistable nitroso-reductant intermediates.
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