Erythrosine (E127): The Tightly Restricted Cherry-Red Dye

Erythrosine (E127) is a synthetic red dye now limited to cocktail and candied cherries in the UK and EU. What it is, who reacts on the skin, and where it still hides.

What it is

Erythrosine is a synthetic, cherry-red dye, an iodine-rich colour that gives a vivid pink-red shade. Once used more widely, it is now one of the most tightly restricted food colours in the UK and EU. Under the retained EU additives rules, it is permitted only in cocktail cherries, candied cherries and bigarreaux cherries in syrup and cocktails, with a maximum level set for those uses, which you can see listed in the Food Standards Agency’s regulated products record for E127. That is why, in Britain, the one place you reliably meet it is the glossy red cherry on a trifle or a Black Forest gateau. In the United States the same dye, known there as FD&C Red No. 3, is being phased out of food.

Who reacts, and how it shows on the skin

For most people erythrosine causes no trouble, and because its permitted uses are now so narrow, exposure is small to begin with. In a minority of sensitive people, synthetic colours can act as a non-allergic trigger for hives (urticaria), the itchy, raised weals that DermNet describes as appearing and fading over hours. These reactions tend to be dose-related rather than a true allergy, so a small amount may be fine while more is not, and standard allergy tests often look normal. Hives have many causes and frequently appear with no identifiable trigger at all, as the NHS notes, so it is worth confirming a pattern before blaming any single colour.

Where it hides

In the UK and EU the realistic list is short: cocktail and candied cherries, glace cherries, and bigarreaux cherries in syrup, so think trifles, cakes, ice cream sundaes and some cocktails. You may also meet it in imported sweets and snacks made to other countries’ rules, and occasionally as a colourant in some pills and supplements. On a label, look for erythrosine or E127.

What to do

If you suspect a reaction, keep a simple food-and-skin diary and note whenever cherries or cherry-topped foods appear, looking for the same trigger to line up with flares more than once before cutting anything out. Because erythrosine is so restricted, a repeated reaction to “red sweets” is more often down to azo dyes like allura red or ponceau 4R than to erythrosine, so identifying the exact colour matters. If your hives are frequent or persistent, see a GP, since recurring urticaria deserves proper assessment rather than guesswork.

Check it against your own list

A free database like Open Food Facts lets you look up a product’s additives and labels, and a scanner like Yuka gives a packaged item a general health score, both useful broad reads, though that verdict is the same for everyone rather than tuned to your skin. To check a product against the specific things that make your skin react, a personal-list app like ClearaScan lets you save your triggers once and scan any product, food, medication or cosmetic against your own ingredient guard list, flagging only yours. Its Reaction Journal lets you tie a flare back to the product that caused it, a shared Care Circle lets family scan for you, and a Trusted Products list keeps what you have cleared, and it is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)