Pyrotechnics in the Studio

Any form of fire in a TV or movie studio must be rigorously controlled and constantly monitored. Several huge studios have been totally destroyed because these rules were not observed. Nevertheless viewing audiences do not pay to see regulations – they demand realism and are entitled to be given it. To achieve this safely is the responsibility of the production unit.

Detonators and pyrofuses

Detonators cannot be used to set fire to things, but pyrofuses are designed specifically for this purpose. To ignite gas or inflammable liquids successfully they require a primer – a small amount of flash powder or gunpowder placed around their heads.

Used to ignite gunpowder or flash powder pyrofuses should be buried in the heart of the mixture, ensuring that they are not against the wall of the container. Where this is a polythene bag it is possible for the head of the pyrofuse to fire through the plastic without igniting the contents.

Fireworks

Pyrotechnics are frequently used in the studio, most popular being the small magnesium (or aluminium) flashes associated with magicians’ tricks and illusions.

Other fireworks often seen in productions are sparklers, which may be held in the hand, used to simulate slow-burning fuses or set out simply as decorations. They should be initiated by another firework (a port-fire) or a small gas torch; ordinary matches produce insufficient heat and take too long.

The conventional hand-held golden rain firework, when slipped into a welder’s torch, can be used to simulate the cutting open of a safe door. A surface of wax applied to the door beforehand enhances the effect.

For a close-up on a safe-cracker’s face a sparkler may be held just off camera to imply that cutting is taking place.

For fiesta sequences and dance routines a curtain of fire can be arranged by hanging micagerbs on an overhead line. The golden sparks discharged from these devices are incandescent mica flakes which quickly lose their heat and their power to ignite.

Safety

For emergency use it is essential to keep fire extinguishers to hand wherever fire effects are taking place, but for the dowsing of small local fires, spent cases, etc. a pump-up garden spray is more suitable.

PYROTECHNICS IN THE STUDIO

1. A selection of indoor and outdoor pyrotechnics for professional use.

2. Gas filled balloons can be employed to give a quick burst of flame.