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 […]