A gerb one of the most common pyrotechnic effects
What it looks like
A gerb looks like a fountain of sparks, that usually lasts for
5-15 seconds (the "bursts" of sparks are called jets, but
basically work the same way) They are pretty much soundless or make a hissing
sound.
The sparks are usually silver or gold coloured, but they can also be
just about any other colour of the rainbow
How it works
A gerb is a cardboard tube that contains a mixture of propellant (usually
the same stuff used in rocket engines for model rockets), burning material
(magnesium) and colourant:
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