Arsenic, cadmium, chromium, cobalt, copper, lead, manganese, nickel and zinc have been estimated in 18 permitted and 18 non‐permitted food colours. Arsenic, chromium, copper and lead were found to be within the maximum allowable international limits in all the permitted colours, but they were in excess in a number of non‐permitted colours. There is a case for establishing the maximum allowable concentration (MAC) of cadmium, cobalt, manganese, nickel and zinc in food colours.
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Khanna et al. (1976) studied this question.
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