charcoal
noun [ U ] uk/ˈtʃɑː.kəʊl/ us/ˈtʃɑːr.koʊl/
木炭;炭笔
a hard, black substance similar to coal that can be used as fuel or, in the form of sticks, as something to draw with
charcoal for the barbecue 烧烤用的木炭
I prefer sketching in charcoal to pencil. 比起铅笔来，我更愿用炭笔画素描。
a charcoal drawing 炭笔画
The uniform is charcoal (grey) (= dark grey) and red. 制服是深灰色配红色的。