What type of malt creates an earthy phenolic note in Scottish beer?

Peat smoked malt is responsible for imparting an earthy phenolic note in Scottish beer primarily due to its unique flavor profile that derives from the smoking process used during malt production. This type of malt is made by drying the barley over an open flame using peat as the fuel source, which infuses the malt with distinct smoky and earthy characteristics. These flavors are particularly characteristic of certain styles of Scotch ales and can add complexity and depth to the beer.

Other types of malt, like chocolate malt, crystal malt, and base malt, focus on sweetness, body, and color rather than the specific earthy phenolic notes that peat smoked malt brings. Chocolate malt generally provides roasty, chocolate flavors; crystal malt contributes caramel sweetness and body; while base malt serves as the foundation of the beer's malt profile, delivering fermentable sugars without the smoky or earthy attributes noted in peat smoked malt.