Soot Particles Times 4 (image) Michigan Technological University Caption This is a field emission scanning electron microscope images of different categories of soot particles from biomass smoke identified by scientists Claudio Mazzoleni and Swarup China. Each has different optical properties, and only 4 percent are uncoated, bare soot. Credit Swarup China Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.