Salmiak is the Scandinavian name for ammonium chloride (NH4Cl), a naturally occurring mineral salt with a sharp, slightly astringent flavor that is used as a standard ingredient in Scandinavian and Dutch licorice candy. It is the compound responsible for the distinctive sharp, savory edge that makes Nordic licorice unlike any other candy in the world. Outside of Northern Europe, it is virtually unknown as a food ingredient. Inside Scandinavia, it is simply what licorice tastes like.
What Is Ammonium Chloride?
Ammonium chloride is an inorganic salt with the chemical formula NH4Cl: one ammonium ion (NH4+) paired with one chloride ion (Cl-). In its pure form, it appears as white crystalline granules or powder with a slightly sour, sharp taste. It occurs naturally in volcanic regions, where it forms around fumarolic vents as a sublimation product of volcanic gases. It was historically mined from these deposits and traded across Europe and Asia under various names, including sal ammoniac, a term derived from the ancient Egyptian site of Siwa, near the Temple of Amun, where early deposits were found.
Ammonium chloride has been used for centuries across multiple industries: metallurgy (as a flux for soldering), textiles (as a mordant for dyeing), medicine (as an expectorant and in traditional remedies), and food. In confectionery, its culinary use is almost entirely concentrated in Northern Europe.
Why Does Salmiak Taste So Different from Ordinary Salt?
Table salt (sodium chloride, NaCl) activates the taste receptor ENaC, producing the familiar salty sensation. Ammonium chloride activates the same receptor but also triggers additional pathways, including a mild acidic perception via the ammonium ion and a faint cooling or astringent sensation. The result is a flavor that is salty but also sharp, slightly metallic, and cooling in a way that table salt is not.
Applied to licorice root extract, salmiak does not merely add saltiness. It amplifies the earthy, bittersweet character of the licorice, adds a sharp top note, and creates a lingering intensity that plain licorice lacks. The combination is what Scandinavian confectioners discovered, refined over generations, and embedded in their candy culture.
How Is Salmiak Used in Licorice?
Ammonium chloride is incorporated into licorice candy in two main ways. First, it is mixed directly into the licorice mass during production, distributing salmiak throughout the candy. Second, it is applied as an external coating or dusting, creating a more immediate hit of intensity on the surface before the licorice flavor develops underneath. Some products use both methods simultaneously, producing what Dutch confectioners call dubbel zout (double salt): salmiak inside and outside.
The concentration of ammonium chloride in the finished candy determines the intensity level. Products at the mild end of the spectrum contain roughly 0.5 to 1% ammonium chloride by weight, noticeable but gentle. Products at the extreme end, including Svenskjavlar by Haupt Lakrits, push well beyond this range into territory that challenges even experienced Nordic palates.
Is Salmiak Safe to Eat?
Ammonium chloride is approved as a food additive in the European Union (E510) and is considered safe for consumption in the quantities used in confectionery. It has been part of the Northern European diet for well over a century with no documented harm from normal candy consumption. Like any food ingredient, it should be consumed in reasonable quantities.
Why Does the Rest of the World Not Use Salmiak?
Salmiak licorice is an almost entirely Nordic and Dutch phenomenon, with minimal presence in other confectionery markets. The reasons are cultural rather than regulatory. Candy traditions are established early and transmitted generationally. Populations that did not grow up eating salmiak licorice have no reference point for its flavor and typically find the initial encounter surprising or challenging. The ingredient is not prohibited elsewhere; it simply never became embedded in other candy cultures.
This is changing slowly, driven by the growth of premium Scandinavian food culture globally. Salmiak licorice is increasingly available in specialty food stores, online, and through brands like Haupt Lakrits that ship across the United States. For many American tasters, the first encounter with genuine salmiak licorice is one of the more memorable food experiences of their lives.
For more on how salmiak fits into the broader Swedish black licorice tradition, see Salty Licorice and Salmiak: The Complete Guide. For the history of how licorice root and salmiak arrived in Scandinavia, see The History of Licorice Root in Scandinavian Medicine. For the full Swedish black licorice overview, see Swedish Black Licorice: The Complete Guide.