Originally posted by Loki
You must be thinking of another rocket.
While using AT propellant for a Loki motor igniter has its humourous side, that's not how we lit the Black Brant motors.
Copper thermite igniters were used. Copper thermite is a powder that was rolled up in a baggie containing two electric matches. When initiated, the thermite reaction creates a very hot (10,000 degrees) cloud of copper metal vapor. The vapor fills the motor core and quickly condenses into small globules of liquid copper. These coat the propellant surface and ignite the propellant. After firing I often find copper residue on the bulkhead, nozzle, and sometimes the launch pad. If you single frame the videos you'll see that the motors come up to pressure in only one video frame. You see a copper plasma ball in one frame and in the next frame the rocket is moving up the launch rail.