There are numerous physical forms of aluminum used
in the manufacture of fireworks. Powders can be produced
in hammer mills, ball mills forming types of flake,
or by atomization, which forms spherical particles,
Large flake aluminum is known as Flitter,
while the smaller flakes are known as Fine bright
or Bright, these both are a bright silver
in appearance and feel greasy to the touch.
are formed by stamping with a lubricant, and producing
small flat plates of foil-like particles, of irregular
shape with a larger surface area.
Another variety of
flake is called Dark Pyro, which is very fine (mesh
size 200), this is a dull dark grey in appearance, possibility
due to up to 2% of carbon it often contains.
the term Bronze and Flitter are used as is the term
schliff for flake and pyroschliff
for very fine flakes, brand names include Black
head, Blue Head and Gloria.