The effect of modification of Cabot Corporation SPHERON 5000 carbon black suspended in bi-distilled water by laser irradiation (CuBr 2 laser with fundamental wavelength of λ= 511nm and 2 kHz repetition rate) has been studied. The carbon black suspensions were prepared by mixing 0.10 g carbon black previously treated with acetone in 100 ml bi-distilled water. Different laser beam fluencies and different irradiation times were used in order to optimize the modification process. The modified suspensions were decanted after sedimentation and dried. The powder fractions obtained were studied by scanning electron microscopy, X-ray diffraction and Raman spectroscopy.