Patent Blue V (E 131)

Last reviewed October 19, 2026

In plain words: Patent Blue V (E 131) is a synthetic blue food color. It is a type of dye called a triarylmethane dye.

Identity

Patent Blue V. Number: E 131. Function: color (blue, synthetic). What it is: a synthetic triarylmethane dye.

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This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.