This is the satisfying moment a factory worker added yellow gunpowder to a batch of firecrackers.

Soothing footage shows the pyrotechnician intricately injecting a vibrant color mixture into the casing of the crackers in Hunan, China, on August 20.

The man places the substance onto each hole, moving like a robot due to how fast and steadily he adds it.

After filling them all, he then used different equipment to add the gunpowder in the middle of the casing with a small dot.

Research suggests that liquid explosives can be safer to handle and transport than solid explosives under certain conditions. They can be less sensitive to shock and friction, reducing the risk of accidental detonation.