Steel Powder, Granular 50 mesh
50 mesh. [Fe + C] dark-gray powder.
This is uncoated steel powder is used for bigger fountains and sometimes stars.
Sold by the pound.
To get the beautiful branching sparks you see in fountains, use steel rather than iron powder. It is the carbon in steel, which makes the pretty branching sparks.
This powder should be coated with linseed oil if you are going to store your devices for longer than a month. Linseed oil prevents the steel from corroding in pyrotechnic mixtures.