Honey Adulteration and Origin Verification

Honey adulteration means adding syrup or other sugars to honey, feeding bees syrup so that they store syrup instead of honey, processing unripe honey, or misdeclaring a honey's source and origin; origin testing is determining in the laboratory which plant and which geographical area a honey comes from. Honey is one of the most counterfeited foods in the world. Cheap blends push prices down and undermine consumer trust; the honest beekeeper's strongest defence is traceable production and accurate labelling.

How is honey adulterated?

• Adding syrup directly: After harvest, syrup derived from corn, rice, beet or sugar cane, invert sugar or glucose syrup is mixed into the honey.
• Feeding during the flow: Bees are given syrup while the supers are on. The bees process the syrup and store it in the comb; even if it sits in capped comb, the product does not count as honey.
• Processing unripe honey: Watery honey taken before capping is brought below the moisture limit by driving off water in machines. This product, which the bees did not ripen, does not meet the definition of honey.
• Overheating and over-filtering: By heating honey, or filtering it finely enough to remove its pollen, its origin is concealed and its appearance "corrected".
• Concealing origin: Honey is sold under the name of a different country or area from its real source.
• Misrepresenting the variety: Mixed blossom honey is presented as a valuable monofloral honey (e.g. chestnut, thyme, citrus) or as honeydew honey.

Can you spot fake honey at home?

The short answer: no, not reliably. Common home tests cannot tell real honey from fake; they can also unfairly cast suspicion on an honest producer's honey.

• Glass of water, thumb and paper towel tests: These depend on the honey's moisture, temperature and state of crystallisation; a well-prepared syrup gives the same result.
• Burning and match tests: They have no scientific basis.
• Crystallisation: Crystallisation is natural behaviour for real honey, not a sign of fakery. Not crystallising is not proof of fakery on its own either; some honeys, such as acacia, chestnut and pine honey, stay liquid for a long time.
• Taste and aroma: An experienced taster may become suspicious, but the final verdict belongs to the laboratory.

How is honey adulteration detected in the laboratory?

As adulteration methods evolve, so do the tests. No single test catches every kind of adulteration; laboratories use several methods together.

In Türkiye the quality criteria for honey are set by the Turkish Food Codex Communiqué on Honey; this communiqué sets limits for moisture, HMF, diastase, sugar composition and adulteration indicators such as C4 sugars. Samples taken in official inspections and for export are assessed against these criteria.

How are a honey's origin and source determined?

Botanical origin: pollen analysis

Pollen grains get into honey along with the nectar. In the laboratory these grains are identified and counted under a microscope; which plant's pollen predominates shows whether the honey is a monofloral honey. The pollen percentage threshold varies from plant to plant: some plants, such as chestnut, leave a lot of pollen in honey, others very little. That is why the decision is made using pollen analysis together with colour, taste, electrical conductivity and sugar composition.

Honeydew honeys

Honeydew honeys such as pine honey are made not from floral nectar but from the excretions of insects that feed on plant sap; these honeys contain little pollen. The origin of a honeydew honey is assessed from its high electrical conductivity, its sugar composition and the honeydew elements, such as fungal spores and algae, seen under the microscope.

Geographical origin

Geographical origin is assessed from the region-specific pollen spectrum and from NMR and isotope profiles. For honeys registered with a geographical indication, the production area and method are defined in the registration document; the name may only be used for products that meet those conditions.

Why is over-filtering a problem?

Very fine filtering also removes the pollen grains from honey. The honey becomes visually clear, but the trace of its origin is erased. In honey stripped of its pollen, botanical and geographical origin cannot be proven; that is why over-filtering raises suspicion of origin concealment. In much legislation, honey with reduced pollen content has to be sold under a separate name. For the beekeeper, straining with a coarse and a medium sieve is enough.

What should an honest beekeeper do?

Adulteration does not only happen through deliberate fraud; poor practice can also push honey outside the legal criteria.

• Don't feed while supers are on: Feeding and harvest must be kept strictly apart. Don't move combs containing syrup left over from winter or spring feeding up into the supers.
• Wait for ripeness: Don't extract uncapped honey; measure the moisture in partly capped frames.
• Don't heat honey: If crystallised honey needs to be liquefied, use a low-temperature water bath.
• Keep harvests separate: Extracting separately by apiary and period is the basis of a monofloral honey claim.
• Keep records: Record the apiary location, forage period, harvest date, feeding and treatments. A claim of origin can only be defended with records.
• Follow the treatment rules: Use varroa treatments only when there are no supers on and as licensed; residues are not adulteration, but they make honey unsaleable.
• Get it analysed: For valuable batches, getting an analysis report from an accredited laboratory both reassures the buyer and protects you.

Labelling and legislation

Labelling rules vary from country to country and are updated over time. Honey sold in Türkiye must comply with the Turkish Food Codex rules on honey and labelling. In the European Union too, recent rules have made it compulsory to state the countries of origin of honey blends more clearly.

• Correct name: A monofloral or regional name is only used if it is backed by analysis and records.
• Origin: If you blend honeys from different countries or areas, declare it honestly.
• No health claims: Claims that honey cures disease may not appear on the label or in promotion.
• Batch number: It must be possible to trace which batch every jar came from.