On the other hand, we know that enamels on metal are first mentioned in the Ming annals about the middle of the fifteenth century. They take their name of Cheng-tai enamels from the emperor who reigned at that period; but the proper Chinese term for such enamels is Folang chien yao—‘the inlaid ware of Folang.’ Julien interpreted these words ‘Porcelaines à incrustations (ornées d’émaux) de France,’ and Dr. Hirth carries us to Bethlehem! But the word Folang is probably the same as the term Folin or Fulen, used as early as the sixth century for the Roman empire of the East, and it may possibly be connected with the Greek πόλις (cf. Stamboul = Εἰς τὴν πόλιν).[45] It is definitely stated by a later Chinese writer that the same colours are employed by both the enameller on metal and the decorator of porcelain.
If we examine the colours found on both the wares to which we have tentatively traced back the enamelled porcelain of the Chinese—the enamels on glass on the one hand, and those on metal on the other—taking in each case the earlier specimens as examples, we find on the mosque lamps from Cairo little except a deep blue generally used as a ground for a design which is outlined in an opaque iron red. On the famous flask from Würzburg, now in the British Museum, for which a ‘Mesopotamian’ origin of the thirteenth century is claimed, a turquoise blue relieved by gilding is the predominant note; there is also a sparing use of yellow, of an opaque white, and, what is especially interesting, of a fine pinkish red, which is possibly obtained from gold. (The way in which this colour is shaded into the opaque white reminds us of the similar use of the rouge d’or in later times in China.)
If, on the other hand, we turn to the earlier Chinese enamels on metal, the so-called Ching-tai vases, attributed to the fifteenth century, we find among the colours used an opaque iron red, a yellow, an opaque white, and finally two kinds of blue, a turquoise and a full deep blue that looks like a cobalt colour.[46]
Some time, then, during the sixteenth century, whether before or after the accession of Wan-li (1572), the Chinese began to decorate the surface of their porcelain with jewel-like enamels appliqués to the glaze. At first, apparently, these colours were confined to three: a copper green, a yellow generally of a buff tint, probably containing antimony as well as iron, and a purple derived from manganese. These are the San-tsai or three colours of the Chinese writers, and it will be seen that they differ from the colour triad of our ‘painted glazes’ (painted, that is, on biscuit and reheated in the demi grand feu) in that the copper silicate is of a turquoise blue in the latter, and in the former of a full leafy green. The Chinese authorities further tell us that a second scheme of decoration was given by the Wu-tsai or the five colours which were made up by the three already mentioned, with the addition of an opaque red derived from the sesqui-oxide of iron (otherwise known as hæmatite, bole or red ochre),[47] and finally of a cobalt blue, sous couverte, surviving as it were from the earlier blue and white ware, for, as we have mentioned, the use of the blue as an enamel over the glaze belongs to a later period.
So much for the teaching of the Chinese books; but when, attacking the subject from the other side, we examine the specimens of enamelled ware which for one reason or another—the coarseness and thickness of the paste, the moulded form, and the irregular surface—we should be inclined to attribute to the Ming dynasty, we are led to classify these earlier examples somewhat as follows:—
1. On a white ground a design, often, it would seem, of textile origin, roughly painted in an opaque red (like sealing-wax), with the addition of a leafy green and very rarely of a little yellow. This is a class of decoration much imitated in Japan at a later date, especially by the artist potters of Kioto and at Inuyama.
2. The same colours with the addition of blue, sous couverte. The design often takes the form of figures in a landscape, the whole broadly treated. The earliest type of the Imari ware (apart from the Kakiyemon) seems to be based on this scheme of decoration.
Both these classes are distinguished by the white ground, the sparing use of yellow, and the almost complete absence of manganese purple and turquoise blue.
3. A transparent enamel of leafy green, yellow and manganese purple painted on in washes so as to cover the whole ground. When with these colours we find the outline drawn in black, we have the basis of a large part of the famille verte. On the other hand, it is this class of decoration which probably carries on the tradition of the early Ming ware, sometimes described as ‘enamelled,’ but more probably all of it painted on the biscuit and fired in the demi grand feu.