Flash Powder Questions

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definitely, the best ratio for aluminum and perchlorate is? the best ratio is 34.2% aluminum and 65.8% perchlorate

Aluminum powder and potassium perchlorate are the only two components of the pyrotechnic industry-standard flash powder. It provides a great balance of stability and power and is the composition used in most commercial exploding fireworks.
by looking at The balanced equation for the reaction we can find the true and best ratio, and The balanced equation is:

3 KClO4 + 8 Al → 3 KCl + 4 Al2O3
The stoichiometric ratio is 34.2% aluminum and 65.8% perchlorate by mass. A ratio of seven parts potassium perchlorate to three parts dark pyro aluminum is the composition used by most pyrotechnicians.

For best results, the aluminum powder should be "Dark Pyro" grade, with a flake particle shape, and a particle size of fewer than 10 micrometers. The KClO4 should be in powder form, free from clumps. It can be sieved through a screen, if necessary, to remove any clumps prior to use. The particle size of the perchlorate is not as critical as that of the aluminum component, as much less energy is required to decompose the KClO4 than is needed to melt the aluminum into the liquid state required for the reaction.

Although this composition is fairly insensitive, it should be treated with care and respect. Hobbyist pyrotechnicians usually use a method called diapering, in which the materials are poured separately onto a large piece of paper, which is then alternately lifted at each corner to roll the composition over itself and mix the components. Some amateur pyrotechnicians choose to mix the composition by shaking in a closed paper container, as this is much quicker and more effective than diapering. One method of mixing flash is to put the components in the final device and handling the device will mix the flash powder. Paper/cardboard is chosen over other materials such as plastic as a result of its favorable triboelectric properties.

Large quantities should never be mixed in a single batch. Large quantities are not only more difficult to handle safely, but they place innocent bystanders within the area at risk. In the event of accidental ignition, debris from a multiple-pound flash powder explosion can be thrown hundreds of feet with sufficient force to kill or injure. (Note: 3 grams of the mixture is enough to explode in the open air without constraint other than air pressure.)

No matter the quantity, care must always be taken to prevent any electrostatic discharge or friction during mixing or handling, as these may cause accidental ignition.

this is video for this ratio

but if you looking for the best flash powder with a small amount give a load report see this video

I hope this post helps you all, be a safe and good look.