FG, FFG, FFFG....used to describe -: (A) Primer, (B) Caridge, (C) Black gunpowder, (D) Base of firearms
Answer is C. the synopsis of forensic medicine & toxicology ; Dr k.s narayan reddy ; 28th edition ; Pg.no. 125 ; Black powder is designated as FG,FFG,FFFGetc depending on the size of grains . The more number of F the finer are the grains & faster is the burning .