'Soot' in the Bible

Then the Lord said to Moses and Aaron, “Take for yourselves handfuls of soot from a kiln, and let Moses throw it toward the sky in the sight of Pharaoh.

So they took soot from a kiln, and stood before Pharaoh; and Moses threw it toward the sky, and it became boils breaking out with sores on man and beast.

Their appearance is blacker than soot,They are not recognized in the streets;Their skin is shriveled on their bones,It is withered, it has become like wood.