Flash powder is often made with a highly divided metal such as aluminum, magnesium, titanium, or alloys thereof, mixed with a very strong oxidizer like potassium chlorate or perchlorate.I know the basics, oxide, fuel, lowering & speeding.
You should NOT try making this stuff unless you know what you are doing. Even very small quantities of the mixtures can potentially hurt you badly if you don't take the right precautions (without good eye protection a few dozen milligrams could easily take an eye out, and a dozen grams could kill you if detonated too close.) Even if you do everything right, be prepared for the unexpected, it is not stable and can auto-detonate. You need special equipment to even mix the stuff together with risking an explosion.
And I also know the risks, thus I have done several tests on this particular powder, more than I care to count, but I assure you it does not make it any less nerve wracking when doing it, nor does it make me any less careful.
I am only using non-static/spark generating materials and I mix it slowly, you know, those obvious things we all learn.
I hate being arrogant, but I know what I am doing on this level, I just don't know the theoretical ultimatum of ratios, well I do now but that's not the point.
I understand pyrotechnics and I am just starting chemistry which will obviously aid my understanding of such things as well, and no, I am not 15 years old, we just start chem very late, very.
But I thank you for being worried, I suppose you should't just handout recipes over the internet for explosives.As for any reaction, just write down the reaction equation, then multiply the proportions by the atomic/molecular weights of the reagents. That will give you the theoretical optimum chemical ratio. Now consider what losses may occur as the reaction proceeds in a particular physical structure - you will probably decide to add a bit more oxidant to ensure complete combustion of the metal, but to make a persistent visible flame (the point of flash powder rather than an explosive) you might use less oxidant and rely on a third element (like suphur) burning in air to maintain the aluminium or magnesium flame as the charge disperses.
However the rate of any solid reaction depends on the surface/volume ratio of the constituents, and serious technological cunning is required. To get a good flash, you need to mill the components together without heating them, and possibly to coat the metal particles with your slow-burn (sulphur) component. That is the trade secret you should learn on your pyrotechnics course - patience will be rewarded!
A comment that states facts rather than security!
Thanks for the reply, tired of endless replies saying, no, don't do it, might be dangerous, well of course it is! but so is my drain cleaner.
Really looking forward to the course, but for now I am relying on you lads!
Can you remind me again what a "theoretical ultimatum of ratios" is?
I'm a little out of the chemistry scene, but I don't recall this from my grad school days in chemistry.