E-number E131 is a dark bluish-violet synthetic coal tar dye.
Not widely used but can be found in Scotch eggs and is used diagnostically to colour lymph vessels.
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Best avoided by people with allergy reactions as it can cause skin sensitivity, a rash similar to nettle rash, itching, nausea, low blood pressure, tremors and breathing problems.
Not recommended for consumption by children.
Banned in Australia, USA and Norway.
