the french flag is referred to as the blank because of its three colors
Flag of France The flag of France (French: Drapeau franÃ§ais) is a tricolour flag featuring three vertical bands coloured blue (hoist side), white, and red. It is known to English speakers as the French Tricolour or simply the Tricolour (French: Tricolore).
Flag of Spain The flag of Spain (Spanish: Bandera de EspaÃ±a, colloquially known as "la Rojigualda"), as it is defined in the Spanish Constitution of 1978, consists of three horizontal stripes: red, yellow and red, the yellow stripe being twice the size of each red stripe. Traditionally, the middle stripe was defined by the more archaic term of gualda, and hence the popular name rojigualda (red-weld).