H & E, Orcein- A medium size artery occurs with its companion vein which has folded over to provide two sections through the same vein. Compare the relative size of the tunica media and tunica adventitia in both artery and vein. The orcein stain has identified elastic fibers. Note the highly scalloped appearance of the internal elastic lamina of the artery and less scalloped appearance of the internal elastic lamina in the veins.