ɪt ɹᵻtˈɑːɹdᵻd bˈɜːnɪŋ ˈiːvən fˈɜːðɚ baɪ jˈuːzɪŋ ˈoʊnli tˈuː pɚsˈɛnt sˈʌlfɜː ænd jˈuːzɪŋ tʃˈɑːɹkoʊl mˌeɪd fɹʌm ɹˈaɪ stɹˈɔː ðæt hæd nˌɑːt bˌɪn kəmplˈiːtli tʃˈɑːɹd.
It retarded burning even further by using only 2 percent sulfur and using charcoal made from rye straw that had not been completely charred.