The new technique had the primary advantage of permitting a far better execution of internal detail. In black-figure vase painting such details had to be scratched into the painted surfaces, which was always less accurate than the direct application of detail with a brush. Red-figure depictions were generally more lively and realistic than the black-figure silhouettes. They were also more clearly contrasted against the black backgrounds. It was now possible to depict humans not only in profile, but also in frontal, rear, or three-quarter perspectives. The red-figure technique also permitted the indication of a third dimension on the figures. However, it also had disadvantages. For example, the distinction of sex by using black slip for male skin and white paint for female skin was now impossible. The ongoing trend to depict heroes and deities naked and of youthful age also made it harder to distinguish the sexes through garments or hairstyles. In the initial phases, there were also miscalculations regarding the thickness of human figures.