The Dusty Black Face
Scholars have said that seeing a dusty black face in a dream might indicate death. Some interpretations also suggest that seeing a dead man with a black face being washed could point to his disbelief and wealth in life, and that the one washing him might deceive him regarding his money. It was also mentioned that a black face in a dream might indicate cowardice for a brave person, or wealth or a short life for an engaged woman.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam