Orginial Article -- http://goo.gl/ggcdUI
Q: Is it harder to make fireworks in certain colors? —Deb S., Ava, N.Y.
A: “It’s harder to make blue. It’s all about balancing heat and the chemical compositions,” says Jim Souza, whose Pyro Spectaculars runs the Macy’s July 4 show, the nation’s largest. Nevertheless, blue will abound in this year’s main act: a dazzling American flag launched from the Brooklyn Bridge.
Ever wonder how they make fireworks into shapes? Basic fireworks are spheres, Souza says. Cut one in half and you’ll find chemical “marbles” carefully arranged as, say, a smiley face or a star. When the fuse hits the explosive powder at the center of the marbles, boom! They shoot into the sky but maintain their original formation.
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How much does it cost to set off one firework? “It should be anywhere from fifty dollars to five hundred dollars,” Souza says. “It depends on the size, the complication of the design.” The projected cost for the Macy’s July 4 show, he added, is in the “seven figures.”
No surprise, considering the effort required to pull off the country’s most iconic firework display. “Right after the shell [goes off] in the grand finale, we start planning for the following year,” Souza says. “We’re immediately looking at the effects that worked, things we wanted to improve, or new ideas come from that. We’re off traveling the world trying to find new effects.”