Lampblack n. : The fine impalpable soot obtained from the smoke of carbonaceous substances which have been only partly burnt, as in the flame of a smoking lamp. It consists of finely divided carbon, with sometimes a very small proportion of various impurities. It is used as an ingredient of printers' ink, and various black pigments and cements.

Example:
where can I order Lampblack in the UK?

Taxonomy
soot, carbon soot, flame, combustion, fuel, particles, free encyclopedia, incomplete combustion, pyrolysis, fires, candle flame, emissions, walls, spheres, liquid fuel, Diesel exhaust, gas-phase, energy back.

Defination from the web:
Lampblack) Jump to: navigation, search. For other uses, see Soot (disambiguation) ... Soot (pronounced /ˈsʊt/) is a general term that refers to impure carbon particles resulting from the incomplete combustion of a hydrocarbon. ...