Rice-greengram blend was extruded using a co-rotating twin-screw extruder: A central composite rotatable experimental design was employed to determine the effect of barrel temperature and screw speed on the colour of tile extrudates using the CIE Lab system of measurement. The colour parameters (L*, a* and b* values) were related (r greater than or equal to 0.876, P less than or equal to 0.01) to the extrusion variables by a second degree polynomial. The lightness (L*) and yellowness (b*) of the extrudates showed marked changes due to extrusion cooking, and were mostly dependent on the barrel temperature.