glEnable(GL_COLOR_MATERIAL);

glColorMaterial(GL_FRONT, GL_DIFFUSE);

glColor3f(0.2, 0.5, 0.8);

/* draw some objects */

glColorMaterial(GL_FRONT, GL_SPECULAR);

/*glColor no longer changes diffuse reflection, it now changes secular reflection */

glColor3f(0.9, 0.0, 0.2);

/* draw some other objects */

glDisable(GL_COLOR_MATERIAL);