Further modifications of burn rate were achieved by shaping the individual powder grains, often into prismatic shapes such as single-perforated hexagonal or octagonal prisms.
fˈɜːðɚ mˌɑːdɪfɪkˈeɪʃənz ʌv bˈɜːn ɹˈeɪt wɜːɹ ɐtʃˈiːvd baɪ ʃˈeɪpɪŋ ðɪ ˌɪndᵻvˈɪdʒuːəl pˈaʊdɚ ɡɹˈeɪnz, ˈɔfən ˌɪntʊ pɹɪsmˈæɾɪk ʃˈeɪps sˈʌtʃ ɐz sˈɪŋɡəlpˈɜːfɚɹˌeɪɾᵻd hˈɛksɐɡənəl ɔːɹ ˈɑːktɐɡənəl pɹˈɪzəmz.