Flags with the color Black; All the flags from WorldFlags.net that uses the color Black.
Many flags may perhaps not be seen as Black thanks to many other dominating colors. But due to the fact that people are searching for some flag they can't remember the name of - but has the color Black on it - we therefore choose to publish all flags that have Black some where on the flag.
Black is often used to symbolize the night sky or som trouble history.