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 South Africa At the time of its adoption, the South African flag was the only national flag in the world to comprise six colours in its primary design and without a seal and brocade. The design and colours are a synopsis of principal elements of the country's flag history. Individual colours, or colour combinations have different meanings for different people and therefore no universal symbolism should be attached to any of the colours.