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Heritage Science
Fig. 11 | Heritage Science

Fig. 11

From: The synthesis characterization of historical novel azo pigments: implications for conservation science

Fig. 11

Plot of the energy of light at inflection point of the spectrum versus Hammett parameter. The compounds are di-substituted Naphthol AS-G diazo-reaction products. The Hammett parameters are averages of the parameters for the substituents of the external aromatic rings. The least squares best fit lines are A-methoxy substituted, and B-substituents without methoxy substituents

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