Final answer:
Inorganic chemistry is crucial for a firework technician to understand the non-carbon-based chemical reactions in fireworks that lead to explosions.
Step-by-step explanation:
A firework technician would need a knowledge of inorganic chemistry. This branch of chemistry deals with substances that are not primarily based on carbon, such as the charcoal (solid carbon), sulfur, and saltpeter (potassium nitrate) found in fireworks. Inorganic chemistry involves studying the design and properties of materials, which is crucial for understanding and handling the chemical reactions that cause fireworks to explode.