Most cake decorators have seen the small brown warning sticker on a bottle of edible glitter without really reading it. It references six E-numbers and a line about hyperactivity in children.
Those six colours carry real legal weight in the UK, even though they’re not banned. They come with a mandatory warning that tells customers something specific: this product may affect a child’s behaviour. Understanding why that warning exists, and what it does and doesn’t mean, matters for anyone decorating cakes professionally.
What Is the Southampton Six?
The Southampton six take their name from research carried out at Southampton University, examining whether certain synthetic colours affected children’s behaviour. The findings were concerning enough that regulators took notice.
The research found a measurable link between six specific artificial dyes and hyperactivity or attention problems in some children, not all, and not from tiny amounts, but a correlation strong enough for the Food Standards Agency to require disclosure.
The six are E102 (tartrazine), E104 (quinoline yellow), E110 (sunset yellow), E122 (azorubine), E124 (ponceau 4R), and E129 (allura red). From here on, this piece refers to them simply as the six, since the E-numbers are worth knowing once rather than repeating.
The rule applies regardless of quantity. A trace amount triggers the same label as a heavy dose, with no scaled version depending on how much is used.
The FSA Warning Label Explained
The wording itself is plain: “May have an adverse effect on activity and attention in children.”
UK food law requires this exact wording on any product containing one of the six, with no exceptions and no reformulation loophole. For bakers, that’s a practical task rather than a crisis: if your glitter or decorations contain any of these dyes, you need to know it and be ready to tell customers, whether on packaging or in conversation.
Most major suppliers have already reformulated away from these colours. Some imported products and budget ranges still use them, which is why checking matters more than assuming.
Which Six Colours Are Covered and Why
The choice of these particular six wasn’t arbitrary. The Southampton research found the strongest correlation with behavioural effects specifically in these dyes, while others tested showed no comparable pattern.
Between them, they cover most of the bright yellows, oranges, and reds used in traditional food decoration: the two yellows, sunset yellow for orange, the two reds, and allura red for the vivid shade seen across countless products. Avoiding the label entirely means working with a narrower palette, which is exactly why natural alternatives have become such a live conversation in baking.
Are the Southampton Six Banned or Just Labelled?
This is where people get confused. The six are not banned, in the UK or anywhere else. They’re legal to buy, use, and sell. The only requirement is disclosure.
Banned would mean you couldn’t use them at all. Labelled means telling people what’s in the product and letting them decide, which is the approach the UK has taken. The EU has been stricter with some of these dyes, but UK law treats this as a transparency issue rather than a prohibition.
In practice, you can still order glitter containing these colours if you want to, provided you disclose it. Most bakers choose not to, simply because customers increasingly prefer products without the warning.
What This Means for Edible Glitter and Cake Decorations
When ordering edible glitter or decorations, this is the first ingredient line worth checking. If any of the six appear on the list, that product needs the warning, and you need to be ready to pass that on to customers.
This becomes especially relevant heading into Halloween and Bonfire Night, when orange, red, and deep yellow decorations are in highest demand, and many of the most vivid shades on the market get there using exactly these dyes. Checking your seasonal stock before the rush avoids an awkward conversation with a customer later.
Many manufacturers have moved to natural colourings entirely to sidestep the issue, and suppliers already avoiding E171 for clean-label compliance tend to have avoided these six as well.
How to Check a Supplier’s Ingredients Are Compliant
Before ordering, pull up the ingredient list and look for the six E-numbers. If none appear, you’re fine. If one does, decide whether you’re comfortable with the warning label attached.
Ask your supplier directly whether the product contains any of them. A reputable supplier will answer in seconds; hesitation is a red flag. Understanding checking allergen and additive labels before you buy is essential practice. Make this part of your ordering routine. Every new product gets label verification.
Natural Colour Alternatives Bakers Are Switching To
The shift away from these dyes has pushed natural colourings into the mainstream. Turmeric gives golden yellows, beetroot gives reds and purples, spirulina gives blues and teals, and charcoal gives blacks and greys. None are quite as vibrant as their synthetic counterparts, but none carry a warning label.
That gap in intensity is closing as demand grows, and more suppliers are reformulating rather than losing business to those who already have.
Conclusion
The Southampton six matter for anyone selling decorated cakes in the UK because customer trust rests on knowing, and being honest about, what’s actually in a product. None of this is about avoiding these colours out of fear. It’s about knowing whether they’re present and being ready to have that conversation.
Natural-colour ranges such as Magic Sparkles offer one straightforward way to sidestep the issue entirely, since plant-based colourings were never part of the equation to begin with.
Where to buy Southampton-six-free edible glitter means sourcing from suppliers who’ve already done the reformulation work. Suppliers who’ve moved to natural colourings or approved synthetic alternatives that don’t carry the warning.
Because at the end of the day, understanding Southampton six food colours isn’t about fear. It’s about knowledge. It’s about knowing what’s in your products and being transparent with the people buying your cakes.
Frequently Asked Questions
What are the Southampton six food colours?
They’re six artificial dyes research linked to potential hyperactivity and attention issues in some children: E102 (tartrazine), E104 (quinoline yellow), E110 (sunset yellow), E122 (azorubine), E124 (ponceau 4R), and E129 (allura red). Any product containing one of them requires a mandatory FSA warning label in the UK.
Are the Southampton six banned in the UK or just labelled?
Not banned. They’re legal to use and sell. UK law requires products containing any of them to carry the warning: “May have an adverse effect on activity and attention in children.” It’s a labelling requirement, not a prohibition.
Does edible glitter contain any of the Southampton six colours?
Some products do, others have reformulated to natural or different synthetic alternatives. Check the ingredient list before buying. Most professional suppliers now offer options free from all six.
What warning does UK law require on products containing these colours?
The exact wording is: “May have an adverse effect on activity and attention in children.” It applies to any product containing even one of the six, regardless of quantity, with no exceptions.
What natural colourings replace the Southampton six in baking?
Turmeric for golden yellows, beetroot for reds and purples, spirulina for blues and greens, and activated charcoal for blacks and greys. These avoid the warning label, though they’re generally less vibrant than synthetic dyes.
