Wine Authentication Technology Explained

Most of the famous wine fakes of the last forty years were caught by somebody checking what an estate had actually produced, not by a device reading the bottle. Wine authentication technology explained in one line: it protects bottles being filled now, and it does much less for the old ones you are actually bidding on. Some producers have started engraving serial numbers into the glass and taking tighter control of how their wine is distributed, and the wider packaging industry offers tamper evident seals, serialised barcodes, holograms, micro-printing, near field communication tags and track and trace codes that link a bottle to a database. For older vintages, The guidance is blunt: "However, for older vintages, the threat of fraud persists, although new techniques, like stable isotope analysis and isoscapes are likely to grow in importance." What exposed Rudy Kurniawan and Hardy Rodenstock was records: who made what, in what format, in which year. Laurent Ponsot knew his domaine had never made a Clos Saint-Denis before 1982.

What does wine authentication technology actually cover?

It secures a bottle from the moment it leaves the winery, and nothing before that. The anti-counterfeiting toolkit catalogued for consumer packaging in general is the same one a producer can put on a case of first growth, and every item on it is aimed at the current release rather than the 1961 in front of you.

Measure	How it works
Engraved serial numbers	The producer cuts a number into the glass itself and keeps a tighter hold on distribution
Holograms	Graphics on seals, patches, foils or labels, checked by eye at the point of sale
Micro-printing	A second line of authentication, the same trick used on currencies
Security pigments and inks	Marks that stay invisible under normal light and appear under ultraviolet
Tamper evident seals and tapes	Destructible, or verifiable by their graphics at the point of sale
Near field communication tags	Short range wireless that stores information between devices
Track and trace systems	Codes that link the product back to a database
Taggant fingerprinting	Uniquely coded microscopic materials, verified against a database
DNA tracking	Genes embedded onto labels that can be traced
Colour shifting ink or film	Visible marks that switch colour or texture when tilted

None of it is a guarantee. We note of authentication seals and security printing that "these too are subject to counterfeiting". Treat any of these as one input, not a verdict.

Why do production records catch more fakes than lab tests?

Because a forger can copy a label, but cannot invent a wine an estate never made. In 2008 Kurniawan consigned bottles said to be Domaine Ponsot Clos Saint-Denis Grand Cru, a Burgundy grand cru, with vintages running from 1945 to 1971. Laurent Ponsot, head of the domaine, said it had never made a Clos Saint-Denis before 1982. He contacted the auction house and the lots were removed. Kurniawan's indictment later added six bottles of Domaine Georges Roumier Bonnes Mares 1923, sold at a 2006 auction for $95,000, on the reasoning of lead prosecutor Jason Hernandez that Roumier produced no wine before 1924.

The pattern repeats. At the 2007 TASTE3 conference in Napa, David Molyneux-Berry, former head of the wine department at Sotheby's, noted that only five magnums of the 1947 Château Lafleur were ever produced. Kurniawan had offered eight of them across his two 2006 auctions at Acker, Merrall & Condit. In April 2007 he consigned magnums of 1982 Château Le Pin at Christie's in Los Angeles, prominent enough to be on the catalogue cover, and representatives of the estate told the auction house they were fake. The lot was withdrawn. When David Peppercorn and Serena Sutcliffe questioned the six litre Imperials of Château Pétrus from 1921, 1924, 1926, 1928 and 1934 that Rodenstock served in 1989 and 1990, their concerns were never proven and Rodenstock disputed them, but Christian Moueix, the estate's manager, confirmed Pétrus has no records of producing Imperials in those vintages. Not one of those challenges needed a laboratory. Each needed a filing cabinet and somebody willing to read it.

What did forensic testing prove in the Jefferson bottles case?

It put a modern tool on the engraving and a modern date on the wine. In 1985 Rodenstock produced bottles said to have come from a walled-up cellar in Paris, engraved with late eighteenth century vintages and the initials "Th. J.", taken to mean Thomas Jefferson. One, a 1787 Château Lafite, sold at Christie's in London on 5 December 1985 for 105,000 pounds. The catalogue had listed the value as "inestimable", and as of 2007 the price still stood as the worldwide auction record for a single bottle of wine.

Bill Koch bought four bottles of Château Lafite and Branne-Mouton from the 1784 and 1787 vintages in 1988, paying about 500,000 US dollars. He only went looking for provenance in 2005, when the Boston Museum of Fine Arts asked for it before an exhibition. His staff found nothing beyond Michael Broadbent's authentication of the bottles, and the curator of the Thomas Jefferson Foundation at Monticello replied that on Jefferson's own records the foundation did not think the bottles had been his. Koch then hired a retired FBI agent and had forensic work done on the wine, the bottles and the engravings. He alleges the engravings were cut with an electric power tool, which was not possible in the eighteenth century. The Billionaire's Vinegar reports a tritium test and two carbon-14 tests dating the wine to around 1962. The German magazine Stern offered to pay for analysis by the Federal Institute for Materials Research and Testing, the laboratory that established the Hitler Diaries were faked. Rodenstock declined. A German court had already found in 1992 that he had "knowingly offered adulterated wine" for sale, a case settled out of court on appeal, and a New York federal court entered a default judgment against him in May 2010 after he refused to take part in Koch's suit.

How much counterfeit wine is out there?

Nobody has a clean number, and the honest estimates are uncomfortable. Wine Spectator noted that as much as 5% of the wine sold in secondary markets could be counterfeit. The 2016 documentary Sour Grapes states that as many as 10,000 counterfeit bottles created by Kurniawan may still be sitting in private collections. In 2022 a Europol and Interpol operation called OPSON XI, led by the European Anti-Fraud Office, seized nearly 14.8 million litres of illicit drinks including wine and beer, together with counterfeit bottles, packaging, and equipment for making sparkling wine.

The production side is cheap, which is the whole problem. When the FBI arrested Kurniawan at his home in Arcadia, California on 8 March 2012, agents found inexpensive Napa wines with notes indicating they would be passed off as older Bordeaux vintages, along with corks, stamps and labels. He had been buying inexpensive but genuinely old Burgundy and relabelling it with prestigious producer names and vintages. In China, counterfeiters photocopy labels, invent chateau names for the capsule and the label, and sometimes refill an authentic bottle using a syringe. Christie's has begun smashing empty bottles with a hammer so they cannot re-enter the black market. At one 2008 sale a French vintner was "shocked to discover that '106 bottles out of 107' were fakes." Producers often cannot fight back: "There are no funds. Each lawsuit costs 500,000 euros," one French vintner said.

What should you check before you bid?

Establish what the estate produced in that vintage and that format, then establish who has owned the bottle since. Format is the sharpest tripwire an amateur can use, because a fake is rarely just a label. "Label fraud, to be done well, requires bottles, corks, and packaging to be similarly manipulated." Koch alleges that Rodenstock moved 818 bottles into the United States through Royal Wine Merchants between 1998 and 2008, virtually all rarities, of which 87% were magnums. A long run of rare wine in a rare size is a question, not a bargain.

Provenance does the rest. Koch paid half a million dollars for four bottles and asked for the ownership trail years later, when a museum forced the issue. Our guide to spotting a fake wine bottle by inspection covers what the glass, capsule and label can tell you, and what wine provenance actually means covers the paper trail. If you are bidding rather than buying retail, read how the main wine auction houses compare first. In the Ponsot and Le Pin cases the lots came off the block because a producer picked up the phone, which is a thin thing to rely on and the reason a house's own withdrawal record is worth knowing.

What is being done beyond the bottle?

Regulation came first and still does most of the work. European governments built appellation systems and protected designations of origin precisely to stop wine from a lesser region being sold under a grander name: the Appellation d'origine contrôlée in France, the Denominazione di origine controllata in Italy, the Denominação de Origem Controlada in Portugal and the Denominación de Origen in Spain. Producers registered in an appellation have to abide by its rules, including the exact percentage of grapes that must come from the region, and the French government founded the Service de la Répression des Fraudes to detect and stamp out fraud among AOC wines.

Outside wine, the direction of travel is digital identity. High fashion houses including Mugler have begun using blockchain technology to give products a unique digital identification and to make authentication and ownership records simpler, and the European Commission has set out rules requiring Digital Product Passports for new textile products made in or imported into the EU from 2030. Neither reaches a case of 1961 claret sitting in a warehouse. For the back vintages already in circulation, the estate's own records and the ownership chain are still the authentication technology that decides it.

Price is the third check, and the one most buyers skip. Before you commit to a lot, see what the wine has actually been doing against the rest of the market on our live fine wine market index, and take the newsletter if you would rather have that reading arrive than go looking for it.