Graphite is a black and shiny powder or rods. Used for glazing black powder grains to give it a better flow, or as dry lubricant for different tools. Also used to opacify rocket fuel grains. The opacifier accelerates the rate of surface burning and prevents infrared energy from penetrating the propellant grain and causing it to explode.
Pencil cores, ebay
The substance is toxic to upper respiratory tract.The substance may be toxic
tocardiovascular system. Repeated or prolonged exposure to the substance
can produce target organs damage.