Archived posting to the Leica Users Group, 1997/09/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Flash powder is explosive, use with extreme care and at your own risk! R/ 3 parts potassium perchlorate 3 parts potassium chlorate 4 parts magnesium powder how to prepare combine potassium compounds and grind them very finely, but always keep the magnesium separate until immediately before exposure. Mix the powders very carefully. Ignite using a touch-paper. A touch-paper can be made by soaking paper in a strong potassium nitrate solution and drying it. Flash powder produces light with a color temp. of about 4300K, small quatities give a warm color, larger heaps produce a color that is approx. daylight. Use ISO 100 print film and an aperture of f/11 6 ft 1 gram 12 ft 2.5 gram 24 ft 7 gram 36 ft 12 gram Spread larger charges in a line and ignite in the middle. It is probably safer to buy the powder from a theatrical supplier - -------- Regards, Bert Keuken homepage: http://home.pi.net/~bertkeuk/home.html "Macintosh users are the snobs of the personal computer business" - Robert X. Cringely