Collect. Czech. Chem. Commun. 1957, 22, 1416-1420
https://doi.org/10.1135/cccc19571416

Metallochromic indicators. II. 3,4-Dihydroxy-4-nitroazobenzene and 3,4-dihydroxyazobenzene-4'-sulphonic acid as simple metallochromic models of pyrocatechol violet

J. Körbl, E. Kraus, F. Jančik and R. Přibil

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