Flame Iron On Transfers Burning An Iron In A Luminous Flame Can Cause "dark Coal" At The End, What Do You Call That "dark Coal"?

Burning an iron in a luminous flame can cause "dark coal" at the end, what do you call that "dark coal"? - flame iron on transfers

Actually

When you save an easier or more by a burner fuel (for example, is promising propane, butane, etc.) with the air hole closed the flame, because it contains tiny particles of carbon, formed when Teststoßes with oxygen. (In very limited oxygen, certain forms of carbon with carbon dioxide and water should be). The black dust deposited in the little flame is simply carbon.