Two further decorative motives lead us back into the region of metal-work, the scale-pattern extending over the whole body of the vase (Fig. 38), which so often occurs in incised metal-work, and the tongue ornament, the typical decoration of bronze vessels, which on clay vases as well often rises over the foot in place of the kindred rays, but most commonly finishes the shoulder where it meets the neck. Both motives have already been met with in Crete, as applied on a black ground. The black ground technique of the Praisos jug (Fig. 26) is very popular with Protocorinthian artists, goes alongside of the clay-ground vases for the whole period, and supplies richly coloured examples decorated with figures and ornaments of fine effect, particularly in combination with a new technique, which appears in the advanced style, [Illustration: PLATE XVII. Fig. 34. BELLEROPHON AND THE CHIMAERA FROM A PROTOCORINTHIAN LEKYTHOS. Fig. 35. PROTOCORINTHIAN JUG, KNOWN AS THE CHIGI VASE.] being specially typical of scale and tongue ornamentation, that of incision. It is perhaps idle to inquire into its invention: it is more important to establish the fact, that it was first consistently and systematically applied to the black-ground vessels of the Protocorinthian artists, who were also famed for metal-work, and gave a new stamp to the style at a time when the East used simple brush technique almost exclusively. The incised line is always combined with the addition of coloured and particularly red details.