Anti-flash bags

The inorganic flash reducers (such.as K sulfate) were usually loaded in small bags separately from the propint, and placed between the projectile and the propint. These anti-flash bags, called in German "Vorlage , consisted of two perforated discs of artificial silk or cotton cloth sewn together in (he form of doughnuts and filled with coarsely pulverized K sulfate. (Ref 1, p 324)... 

The French have used anti-flash bags (sachets antilueurs) filled with the crude potassium hydrogen tartarate (about 70%... 

Sachets Antilueurs (Fr, Anti flash Bags). See under Argoi in Vol 1, A480-L... 

Another method used in France was to add anti-flash pellets, consisting of four parts of potassium nitrate and one part of DNT, to propellant charges. The pellets weighed one gramme each and were about 2 mm thick and 15 mm dia. They were sewn in silk bags, in numbers depending on the calibre e.g. 200-300 were used for a 155 mm gun. Such pellets behaved as a propellant charge and did not reduce the muzzle velocity. 

The Germans used anti-flash charges containing potassium chloride in their cannon propellants. The charges, in bags of artificial silk or cotton cloth, were loaded between the base of the projectile and the propellant. Obviously, all the additions described above increased the smoke formed when the rounds were fired. 

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