Origin:
Blue colour, naturally present in the shrub Indigofera tinctoria , though commercially it is produced synthetically.
Function & characteristics:
Blue food colour. Very soluble in water.
Products:
Many products.
Daily intake:
Up to 5 mg/kg body weight.
Side effects:
Side effects rarely occur in the concentrations used in foods. Rare allergic reactions have been described, due to coupling of the colour to (body) proteins. It can also function as a histamine liberator.
Dietary restrictions:
None; E132 can be consumed by all religious groups, vegans and vegetarians.
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