A history of the negative associations of yellow

From Allen Abel And Madeleine Czigler’s “Submarines, bananas and taxis” (National Post: 24 June 2008):

Depicted in frescoes and canvases from the early Middle Ages onward in the robes of the betrayer of the Christ, “Judas yellow” devolved into an imprint of depravity, treason and exclusion.

By the 12th century, European Jews were compelled to wear yellow hats, prostitutes were bound by yellow sashes and yellow flags flew above the pus-stained hovels of the Black Death. From this would descend our own yellow of cowardice and insanity, and the yellow badges of the star-crossed Jüden of the Third Reich.