sootiness

1. Draw black sootiness makeup.
   画黑色的烟熏妆。
2. An approximate model for predicting flame radiation in both well-and under-ventilated polymer combustion is proposed on the basis of estimation of heat release and flame sootiness.
   本文以火焰中热量和炭颗粒的生成规律为基础，提出了描述通风影响的聚合物燃烧火焰辐射近似模型。

noun

1. the state of being dirty with soot

   Synonym:    smuttiness