References
- Baeyer A, Drewson V. Einwirkung von orthonitrobenzaldehyd auf aldehyd. Chem. Ber. 1883; 16: 2205–2208
- Balfour-Paul J. Indigo. British Museum Press, London 2000
- Christie, RM. (2001). Color Chemistry. Royal Society of Chemistry, London. Chapters 1, 2 and 4.
- Dähne S, Leupold D. Berechnung der quadrupol-merocyanine, einschließlich indigoider färbsysteme, nach einer vervollständigten LCAO-MO-Methode. Theor. Chim. Acta 1965; 3: 1–20
- Dähne S, Fabian J. The polymethine model of indigoides. Vinylogous H-chromophores. J. Inf. Rec. Mater. 1986; 14: 3–20
- Dietz F, Tyutyulkov N, Olbrich G. On indigo color theory. J. Inf. Rec. Mater. 1986; 16: 431–438
- Dietz F, Tyutyulkov N, Rabinovitz M. Anti-aromaticity and color in dyes containing unsaturated five-membered rings. J. Chem. Soc. Perkin Trans. 1993; 2: 157–167
- Dilthey W, Wizinger R. Extension of Witt's color theory on coordination chemical grounds. J. Prakt. Chem. 1928; 118: 321–348
- Griffiths J. Recent developments in the color and constitution of dyes. Rev. Prog. Coloration 1981; 11: 37–57
- Griffiths J. Practical aspects of color prediction of organic molecules. Dyes Pigments 1982; 3: 211–233
- Hutchings MG. Software review – PiSYSTEM for Windows-version-3.1 – a program for the calculation of excited state properties including color of π-electron based molecules. Dyes Pigments 1995; 29: 95–101
- Klessinger M, Luttke W. Theoretische und spektroscopische Untersuchen an Indigofärbstoffen. II. Das Chromophore System der Indigofärbstoffe. Tetrahedron 1963; 19((Suppl. 2))315–335
- Klessinger M. Theoretische und spektroskopische undersuchungen an indigofärb-stroffen, V. PPP-rechnungen am indigochromophor. Tetrahedron 1966; 22: 3355–3365
- Klessinger M. The origin of the color of indigo dyes. Dyes Pigments 1982; 3: 235–241
- Maugard T, Enaud E, Choisy P, Legoy MD. Identification of an indigo precursor from leaves of Isatis tinctoria (Woad). Phytochemistry 2001; 58: 897–904
- Pandraud H. Structure cristalline de l'indirubine. Acta Cryst. 1961; 14: 901–908
- Serrano-Andres L, Roos BO. A theoretical study of the indigoid dyes and their chromophore. Chem. Eur. J. 1997; 3: 717–725
- von Eller, H, 1955. Structure de colorants indigoïdes. V. Comparaison des structures de l'indigo, du thio-indigo et du séléno-indigo. Bull. Soc. Chim. France. 1438–1444.
- Witt ON. Zur kentniss des Baues und der Bildung färbender Kohlenstoffverbindungen. Ber. Deut. Chem. Ges. 1876; 1: 522–527
- Zollinger, H. (2003). Color Chemistry, 3rd ed. Wiley-VCH, Weinheim. Chapters 1, 2 and 8.