Prussian Blue was an American white nationalist pop pre-teen duo formed in early 2003 by April Gaede, mother of Lynx Vaughan Gaede and Lamb Lennon Gaede, fraternal twins born on June 30, 1992, in Bakersfield, California. The twins referred to the Holocaust as a myth and their group was described as racist and white supremacist in nature.

Prussian blue is a dark blue pigment with the idealized chemical formula . To better understand the binding situation in this complex compound the formula can also be written as · x. Another name for the color is Berlin blue or, in painting, Parisian or Paris blue. Turnbull's blue is the same substance, but is made from different reagents, and its slightly different color stems from different impurities.