Dark Grey Dun: This color ranges from a dark medium grey dun to almost black. Generally this color has an overall grey tone but on closer inspection you can see dark tans and browns as well. Another characteristic is a dark bronze flecking over a darkish grey dun base color. This color blends into medium grey dun, brown grey dun, dark brown dun and black. This color is often produced by dyeing. As with dyed medium grey dun it is often hard to differentiate between natural and dyed feathers, and this is even more true with dark grey dun.