The history of this overglaze blue enamel has already[310] been partially discussed, and evidence has been given of its tentative use in the Wan Li porcelain. A passage in the second letter of Père d’Entrecolles[311] actually places its invention about the year 1700, but the worthy father’s chronology (based no doubt chiefly on hearsay) is often at fault. It is fairly certain, however, that the blue enamel was not used to any extent before the Ch’ing dynasty, owing no doubt to the fact that it had not been satisfactorily made until that date.

A beautiful enamel of violet blue tone, it is an important factor of the famille verte decoration, and the merits of a vase or dish are often decided on the purity and brilliance of this colour alone. There is, however, something in the nature of the enamel which seems to affect the surrounding glaze; at any rate, it is often ringed about by a kind of halo of dull lustre, reflecting faint rainbow tints to a distance of perhaps an inch from the edge of the blue. It is as though an exhalation from the blue enamel deposited a thin film of lustre on the glaze, and it is a very frequent occurrence, though not always in the same conspicuous degree. Collectors who are ever looking for a sign have been tempted to hail its presence as a sure proof of antiquity. But it is by no means constant on the old famille verte, and it has yet to be proved that the same enamel will not produce a similar effect on the modern glaze.

In view of the appreciation of famille verte porcelain at the present day a contemporary criticism will be of interest. D’Entrecolles in his first letter,[312] referring to “porcelain painted with landscapes in a medley of almost all the colours heightened with gilding,” says: “They are very beautiful, if one pays a high price, but the ordinary wares of this kind are not to be compared with blue and white.” And again,[313] following an exact description of painting with enamel colours on the finished glaze and of the subsequent refiring of the ware, we read: “Sometimes the painting is intentionally reserved for the second firing; at other times they only use the second firing to conceal defects in the porcelain, applying the colours to the faulty places. This porcelain, which is loaded with colour, is not to the taste of a good many people. As a rule one can feel inequalities on the surface of this kind of porcelain, whether due to the clumsiness of the workmen, to the exigencies of light and shade in the painting, or to the desire to conceal defects in the body of the ware.”

The tenor of these criticisms will not be endorsed by the modern collector of K’ang Hsi porcelain. Famille verte porcelain is enthusiastically sought, and even indifferent specimens command a high price, while the really choice examples can only be purchased by the wealthy. As to the inequalities on the surface, the second of the three reasons hazarded by d’Entrecolles is nearest the truth. The enamels used by the Chinese porcelain painter contain a remarkably small percentage of colouring oxide, and one of the characteristics of famille verte colours is their transparency. To obtain full tones and the contrast between light and shade (even to the limited extent to which the Chinese use this convention) it was necessary to pile up the layers of colour at the risk of unduly thickening the enamel. But the connoisseur of to-day finds nothing amiss in these jewel-like incrustations of colour, so long as the enamels are pure and bright, and have not scaled off or suffered too severely from the wear to which their prominent surface is exposed.

It seems[314] that when the porcelain was destined to receive on-glaze enamels (without any underglaze blue) a special glazing mixture was used in which only one part of the softening element[315] was combined with thirteen of the ordinary glazing fluid. This glaze was very white and strong, and too opaque to do justice to an underglaze blue.

There is a reference in the first letter of Père d’Entrecolles to a white colour which was used on the “porcelain painted in various colours.” It was fluxed with lead like the other enamel colours, and it was also used mixed with the latter to modify their tint. In fact there can be little doubt that it was arsenical white, an opaque white familiar on the Yung Chêng and Ch’ien Lung porcelains, and prominent in the famille rose palette, but not usually suspected of such an early appearance as 1712, the date of the letter in question.

The designs of the famille verte porcelain, like those on the blue and white, are first traced in outline and then filled in with washes of colour. The outlines are in a dry dull pigment of red or brown black tint, inconspicuous in itself, but acquiring prominence when covered with transparent enamel. M. Grandidier tried to formulate certain rules for these outlines which, if reliable, would simplify greatly the task of dating the porcelains. On Ming ware, he said, the outlines were blue; on K’ang Hsi wares the face and body outlines were red, those of the vestments and other objects black. Unfortunately the first of these generalisations is wholly wrong, and the second pointless, because only partly right.

Omitting the underglaze blue as foreign to this particular group of famille verte under discussion, the colours consist of dark leaf green often of a mottled appearance, a beautiful light apple green, which is characteristic of the K’ang Hsi wares just as the blue green is of the sixteenth century polychrome, an aubergine colour (derived from manganese) which varies from purple brown to rosy purple, a yellow of varying purity and usually of brownish tone, a green black formed of the brown black pigment under washes of transparent green, a blue enamel of violet tone, and the thin iron red. The blue enamel and the red are sometimes omitted, leaving a soft harmony of green, aubergine and yellow in which green plays the chief part. A little gilding is often used to heighten parts of the design.

As for the shapes of the famille verte porcelain, they are substantially the same as those of the blue and white and call for no further comment. The designs, too, of the painted decoration are clearly derived from the same sources as those in the blue and white, viz. books of stock patterns, pictures, illustrations of history and romance, and of such other subjects as happened to be specially appropriate or of general interest.

To take a single instance of a pictorial design, the familiar rockery and flowering plants (peony, magnolia, etc.) and a gay-plumaged pheasant lends itself to effective treatment in enamel colours. It is taken from a picture, probably Sung in origin, but there are many repetitions of it in pictorial art, one of which by the Ming painter Wang-yu is in the British Museum collection.[316] The original is said to have been painted by the Emperor Hui Tsung in the beginning of the twelfth century. Another familiar design—quails and millet—is reputed to have been painted by the same Imperial artist.