WordMeaningḥalūbaha she-camel producing milksūdanblack; the herd’s overall colourkhāfiyaha concealed inner part of a featheral-asḥamintensely black
خَافِيَةِ الْغُرَابِ الْأَسْحَمِ
The concealed feather of an intensely black raven.
The comparison specifies a particular part of a raven’s wing rather than merely naming the bird. This sharpens the sense of depth and uniformity in colour.