Then the LORD said to Moses and Aaron, “Take handfuls of soot from the furnace; in the sight of Pharaoh, Moses is to toss it into the air.
Jewish Publication Society of America Version (JPS1917) - Exodus 9:8 >And the LORD said unto Moses and unto Aaron: 'Take to you handfuls of soot of the furnace, and let Moses throw it heavenward in the sight of Pharaoh.