“炭粉”常见的英文表达是 charcoal powder。
“charcoal”意思是“木炭;炭”, “powder”指“粉末”,二者组合“charcoal powder”准确地传达了“炭粉”这一概念。例如:The artist uses charcoal powder to create unique textures in the painting.(这位艺术家用炭粉在画作中创造出独特的质感。)