Sparks still fly in a recession

Fireworks companies stress innovation. In the 1960s, Zambelli introduced electronic firing, eliminating the need for manual operation and allowing producers to more perfectly choreograph and synchronize their fireworks to music.

Today, it's the company's handcrafted pattern shells -- which form familiar shapes such as hearts, stars, and peace signs upon explosion -- that define Zambelli. Using its proprietary pyrotechnic pellet technology, Zambelli can create custom displays for clients: At this year's Target Fireworks in Detroit on June 24, an iconic Target bulls-eye lit the sky.

And more innovation comes with each Independence Day: "This year," says George Zambelli, "we're on the cutting edge when it comes to decreasing the amount of perchlorate in shells," reducing their fireworks' environmental impact. At this year's Philadelphia Park July 4th show, Zambelli will debut perchlorate-free shells.

NEXT: Celebrating the Fourth of July