There are many theories in circulation regarding the origins of the colour scheme used in the 1848 flag. It has been proposed that the colours were those of the Jena Students’ League (Jenaer Burschenschaft), one of the radically minded Burschenschaften banned by Metternich in the Carlsbad Decrees; the colours are mentioned in their canonical order in the seventh verse of August Daniel von Binzer’s student song Zur Auflösung der Jenaer Burschenschaft (“On the Dissolution of the Jena Students’ League”) quoted by Johannes Brahms in his Academic Festival Overture. Another claim goes back to the uniforms (mainly black with red facings and gold buttons) of the Lützow Free Corps, comprising mostly university students and formed during the struggle against the occupying forces of Napoleon. Whatever the true explanation, these colours soon came to be regarded as the national colours of Germany during this brief period, and especially after their reintroduction during the Weimar period, they have become synonymous with liberalism in general. The colours also appear in the medieval Reichsadler.