I'm getting into photography and I want to go old school on my flashes, I seen some good recipes for flash powder. What I need to know is how would one build a flash pot? I would like to be able to controll the direction of the flash. I also know that the nice factory firing circuts are fine but, How ever in the event that I need to add 2 or more flash pots I want to controll the firing of them at one time instead of one by one. I would also like to know what is the main differance between white and photo grade flash powder. Thank you. Edit: I would also like to point out That most of my photography is done in the outdoors and away from AC power. And I do hold safety as A number one on my list.