Conkling: Well, even better choreography—the ability to time fireworks with music so you can match notes of music with fireworks effects ... a reasonable blue. Now, if you start to combine ...

Narrator: Fireworks have been around for millennia. They flood the sky with brilliant bursts of scarlet, emerald, and ivory. But never blue. Pyrotechnicians have tried to produce blue fireworks ...

Displays are created in "colour sequence" with a myriad of colours and effects and barrages and cakes - essentially fireworks displaying almost simultaneously - adding the the overall effect.