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This paper describes the soot behavior in a diesel flame. The experiments were carried out in a constant volume chamber with quiescent atmosphere. Parameters were the ambient temperature and the oxygen concentration. The integrated image of flame was taken, the natural emission of flame was detected and the KL factor was found by means of classical technique of laser light extinction. The results were discussed by use of the apparent rate of heat release. As a result, the ignition delay and the vortex with large scale generated in a diesel spray affect the soot behavior in a diesel flame.