Flash paper will likely be used to simulate sparks or surprising “flashes” right through performances

https://claytontugr170.wordcanopy.com/posts/a-performer-s-guide-to-flash-paper-and-magic-flash-products

Flash paper will be used to simulate sparks or surprising “flashes” in the time of performances. The turbo burn is ideal for timing with track, lighting fixtures cues, and choreography.