* धुएँदार ज्वाला (dhuendār jvalā): This literally means "smoky flame" and is a good general term.
* काजल वाली ज्वाला (kājal vāli jvalā): This translates to "flame with soot" and is more specific to the black, sooty aspect.
* काली ज्वाला (kāli jvalā): This means "black flame" and can be used if the soot is very prominent.
* धूली ज्वाला (dhūli jvalā): This translates to "dusty flame" and is a bit less precise but can work depending on the context.
The best word to use will depend on the specific situation and the level of detail you want to convey.