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The FDA approves indigotine for use in foods in general.6 And several uses have been established by JECFA (Table 5.9). In addition, the maximum level used in foods is 300 mg/kg.24

Erythrosine (E127) was approved in 1969. It is a xanthene colorant and exhibits brilliant color for yellow or bluing red, as well as fluorescence; its precursor is fluorescein. Erythrosine properties are shown in Table 5.10.2324

Fluorescein was one of the earliest synthesized pigments. It is produced by condensation of two molecules of resorcinol with one molecule of phtalic anhydride:

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