| Rating | Solver | Clue |
|---|---|---|
| SOOT | Carbon black | |
| CHARCOAL | A black, porous form of carbon | |
| COAL | ...bstance, dug from beds or veins in the earth to be used for fuel, and consisting, like charcoal, mainly of carbon, but more compact, and often a... | |
| GRAPHITE | Native carbon in hexagonal crystals, also foliated or granular massive, of black color and metallic luster, and so soft as to leave a trace on ... | |
| LAMPBLACK | The fine impalpable soot obtained from the smoke of carbonaceous substances which have been only partly burnt, as in the flame of a smoking lam... | |