Caption:
Various types of fireworks. Pyrotechnics is the science and craft of using self-contained and self-sustained exothermic chemical reactions to make heat, light, gas, smoke and/or sound. Fireworks are a class of low explosive pyrotechnic devices used for aesthetic and entertainment purposes. Pyrotechnics: The History and Art of Firework Making by Alan St. Hill Brock, 1922 (cropped and cleaned).