Thought I might mention this.
Plaster of Paris is calcium sulfate. This can be combined with magnesium of 50-60% or more (rest being aluminum typically) made on sandpaper or a grinding or filing surface.
Adding a small amount of calcium sulfate to a gram of magnesium until it is a consistent greyish powder can yield a fast flash.
Of course there is also reduction based flash produced from sulfur and magensium. Mixing sulfur with magnesium will make a brilliant, brissant flash of light when it is ignited.
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