![caixa prismatica caixa prismatica](https://www.lojaestacaodamusica.com.br/arquivos/PRODUTOS/8781589568858408722/293_G_Pandeiro-Timbra-10-Frmica-Aro-Dourado-Pele-P.jpg)
A pólvora marrom ou pólvora prismática, algumas vezes referido como "pólvora de cacau" devido à sua cor, foi um propelente usado em artilharia de grosso calibre e canhões de navios por volta de 1870.
![caixa prismatica caixa prismatica](https://i.ytimg.com/vi/pnbfIJlbZ3o/hqdefault.jpg)
While similar to black powder, it was chemically formulated and formed hydraulically into a specific grain shape to provide a slower burn rates with neutral or progressive burning, as opposed to the faster and regressive burn typical of randomly shaped grains of black powder produced by crushing and screening powder formed into sheets in a press box, as was typical for cannon powder previously. 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.