Which of the following is NOT a use of pyrotechnics?

The option that is not a use of pyrotechnics is classified as an explosive propellant. While pyrotechnics typically refers to the use of substances that create effects such as light, color, or sound through combustion or controlled explosions, explosive propellants are specifically designed to propel objects and are used in different applications, such as ammunition and rocketry.

On the other hand, colored smoke, training simulations, and fireworks all fall under the umbrella of pyrotechnics. Colored smoke is used in various scenarios, such as signaling or creating visual effects. Training simulations often utilize pyrotechnics to create realistic environments for military or emergency response training. Fireworks exemplify the artistic and celebratory applications of pyrotechnics, designed to produce visual displays in the sky. Thus, the distinction lies in the purpose and application of explosive propellants versus pyrotechnic materials.