What is flash powder? For how long was it used (when did flashbulbs come into use)? Can you still buy it? How do you use it? I remember seeing a Weegie photo with people on a fire escape, at night of course. He said that he backed up across the street and "used flash powder". In the picture, it looks like the whole street is lit up. Was flash powder really bright? Is there still applications for flash powder today?