11. Commercial photographic flash powders are sold as two-part mixtures, to be combined immediately before use. 12. Flash powder should only be made at the site at which it will be used.13. Salute shells usually contain flash powder , producing a quick flash followed by a very loud report. 14. Flash powder of any formulation should not be mixed in large quantities by the amateur pyrotechnician.15. The easiest flash powder formula to make. 16. Charles, a monster movie fan, tries to scare his aunt with a monster costume and some flash powder . 17. Nine pour in the flash powder . 18. Different varieties of flash powder are made from different compositions; most common are potassium perchlorate and aluminium powder. 19. Flash powder is a low explosive.20. Burgess spotted near the body a small bottle of white powder which he assumed to be flash powder .
