A special type of carbon black produced by incomplete combustion of a fuel rich in aromatics that is burned in flat pans. lamp black is characterized by a relatively broad particle size distribution.
Source:
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 496 (https://doi.org/10.1351/pac199567030473)