One of the most interesting semi pyrotechnic effects I have seen was done with a huge piece of white, woven fiberglass cloth (which supposedly doesn't
burn- Well, under normal circumstances, it doesn't)
The cloth, which was about 40' tall and 150' wide had a very large design and words painted on it with clear nitrocellulose lacquer, on ths side AWAY
from the audience. This was not visible, the whole thing was stretched out tight like a curtain, directly in front of audience and maybe 200' away. It
filled a lot of your field of view
Behind it and parallel to it about 20' was a "front" made up of number of "cremora" effects.
In case you've not been exposed to solid fuel fire balls: A 5 gallon plastic paint bucket with about 6oz. of coarse grained black powder, "cannon
powder" or 2FA and an electric match to light it. Then a single thickness piece of newspaper (to keep the powdered coffee creamer from filling the air
spaces between powder grains), then about a 10" deep fill of cheap powdered coffee creamer, as deep as the bucket is wide.
The cremora fireball front fired, a wall of fire wider and taller than the huge screen.
THE DESIGN PAINTED ON THE SCREEN BBURNED THROUGH INSTANTLY, AND WHILE THE FIREBALL WAS STILL FULLY DEVELOPED.
Letters of fire hung in mid air just long enough to read, then the whole thing was gone except for a couple of shreds hanging off the guy wires.
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