Dunkels were the original style of the Bavarian villages and countryside, and it was the most common style at the time of the introduction of the Reinheitsgebot (1516). As such, it is the first "fully codified and regulated" beer. Its ABV is rarely higher than 5.5%, and it has low bitterness, a distinctive dark color, and a malty flavor. Dunkel is brewed using lager yeasts.2
Lighter-colored lagers were not common until the later part of the 19th century when technological advances made them easier to produce.
Dunkel is also widespread in parts of Franconia, for example the Franconian Switzerland, where it has been originally the most common beer type. The region has a lot of microbreweries, of which many still produce Dunkel.3 One Example is Weissenohe Abbey Brewery (Weissenoher Klosterbrauerei).
"German Beer Guide: Dunkel". Archived from the original on 2010-06-09. Retrieved 2010-05-26. https://web.archive.org/web/20100609015418/http://www.germanbeerguide.co.uk/dunkel.html ↩
Oliver, Garrett (2011). "Dunkel". The Oxford Companion to Beer. Oxford UP. pp. 310–12. ISBN 978-0-19-991210-0. 978-0-19-991210-0 ↩
"www.bierland-oberfranken.de". Archived from the original on 2014-02-19. Retrieved 2014-02-26. https://web.archive.org/web/20140219065219/http://www.bierland-oberfranken.de/bierige_pauschalreisen/fraenkische_schweiz__kulinarisches_brauereienerlebnis_144.html ↩