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noir de fumée
chem.	soot; furnace black; acetylene black; flame black; gas black; petroleum black; Paris black; smoke black; lamp black
commun., chem.	lamp-black
crim.law., law, chem.	carbon black
met.	channel black

noir de fumée: 9 phrases in 4 subjects

Energy industry	1
Environment	2
Natural sciences	4
Technology	2