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Brown powder or prismatic powder, sometimes referred as "cocoa powder" due to its color, was a propellant used in large artillery and ship's guns from the 1870s to the 1890s.
By 1871, Krupp had developed a new sort of prismatic powder. It allowed to increase the charge of the 26 cm gun from 32 to 37.5 kg, because it led to lower peak pressures than the previous gunpowder. [16] In 1875, a new kind of prismatic pulver was tested. This was the gunpowder P.P. c/75.
The powder chamber was bored out to accommodate a higher charge of (prismatic gunpowder), and it had a cylindroprismatic breech and a Broadwell ring. The new cylindroprismatic breechblock or Rundkeil (the German word 'Keil' means wedge), was as its name implies almost round.
In the crucial 1868 comparative tests, the 24 cm RK L/20 was only able to beat the British muzzleloading 9-inch Armstrong Gun after it started to use prismatic gunpowder. The first approved type of Prismatic Powder had a density of 1.66 and was known as P.P. C/68, approved in November 1868. [7]
The projectiles fired by the 15 cm L/26 during this test weighed 31.5 kg. The charge was 9.5 kg of roughly granulated (pebble) powder of 13–16 mm or 8.5 kg of prismatic powder with 7 channels and a density of 1.64. The velocity measurement failed. [13] However, from a May 1878 test it was known to be 500–514 m/s. [15]
When the C/86 was designed, the introduction of smokeless powder was still a few years in the future. Therefore, in 1890, the charge was 100 kg of brown prismatic powder. This gave the 215 kg steel grenade an initial velocity of 610 m/s. [21] By the mid 1890s, the charge of the C/86 was only 48 kg of 'Ammon Kuchen Pulver'. [22]
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