A speciality coffee flavour note across London.
Iodine as a flavour note in speciality coffee presents as a sharp, medicinal, and faintly saline quality, sometimes described as reminiscent of sea air, antiseptic, or the mineral character of certain coastal environments. In the cup it tends to be bracing rather than pleasant in isolation, and is often experienced as part of a broader phenolic or smoky complexity rather than as a standalone note. It typically arises from phenolic compounds present in the bean, and can be amplified by certain fermentation conditions during processing or by roast profiles that push into darker, more complex territory.
Iodine notes are typically associated with coffees from island or coastal growing regions, where volcanic soils and proximity to the sea can influence the mineral character of the cup. Indonesian origins, particularly Sulawesi and certain Sumatran lots processed using wet-hulling, often carry this quality alongside earthy, herbal, and woody notes. Natural and extended-fermentation processed coffees from various origins can also develop phenolic compounds that contribute a faintly medicinal or iodine-like character depending on fermentation duration and conditions.
On a bag or cafe menu, look for tasting descriptors that include terms such as medicinal, phenolic, earthy, smoky, or mineral, as these often appear alongside or in place of an explicit iodine note. Indonesian single origins, particularly those labelled as wet-hulled or Sulawesi, are a reasonable starting point for exploring this character. Brew methods that produce a heavier, more textured cup, such as French press or a traditional cupping preparation, tend to foreground these deeper mineral qualities more clearly than lighter filter methods.
Take our 60-second flavour quiz and discover roasts across London that are aligned with your palate — including ones carrying iodine notes.