A. Salehirad - Institute of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
S. Chamyani - Institute of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran

In this work, CoCr2O4 nano pigment was synthesized via low temperature combustion method using oxalic acid/ethylene diamine/citric acid as a new mixture fuel. Physi cochemical properties of the nano pigment were characterized by fourier transform infrared (FTIR), X-ray di ffraction (XRD), while optical properties these powders were characterized by colorimetric test in CIELAB system. In the XRD pattern all the diffraction peaks are attributed to a cobalt chromite spinel single pha se. The average crystallite size of the spinel calculated from the width at half maximum of the XRD peaks by the Debye–Scherrer equation is 15.17 nm.

Nano pigment- Colorimetry- CoCr2O4- Oxalic a cid- Ethylene diamine