What we somewhat vaguely call ‘blue and white,’ that is porcelain decorated under the glaze with designs painted with cobalt blue, has always formed the most important class in the eyes of European collectors, at least of those of England and Holland. This preference has been even more marked with the people of India and Persia, and no wonder, for no combination of colour more suggestive of coolness could be imagined. It has thus come about that this class of ware, more than any other, has been made with the direct object of exportation. This blue and white porcelain of China and Japan, which has found its way into so many lands both of Europe and Asia, has for centuries had the profoundest influence upon the native wares of these countries, whether of porcelain or of fayence.
In China, by the introduction of this process of freely painting with a brush upon the surface of the paste, the potters art was for the first time brought into contact with that of the painter, and thus fell under new influences. The artists of China at that time were divided into many schools, but what we may call the literary or _dilettante_ influence was predominant, and this influence is reflected in the subjects treated on Ming porcelain--subjects which, as usual in China, were handed on to the ceramic artists of the next dynasty. The earliest decoration in blue and white in no way followed, as far as we know, the hierated types of the old bronze ware. Such _motifs_ we do indeed sometimes see repeated on porcelain, but only on pieces that may safely be attributed to a much later date, especially to the pseudo-archaic revival of Yung-cheng’s time (1722-35).
There is no class of Chinese porcelain to which it is more difficult to assign even an approximate date than to this blue and white ware. We may say at once that the _nien-hao_, or the characters giving the name of the dynasty and the emperor, so often found inscribed on the base, are in the vast majority of cases of no value for fixing the date, and this is especially true when the name of a Ming emperor is thus found. What is more, these marks, as far as we can judge (from the knowledge we now possess derived from other sources), do not, as we might have expected, even help us in giving hints of the style prevailing at the period indicated by the date. To take but one example, the reign-mark of Cheng-hua (1464-87) is the one most frequently found on the finest pieces of blue and white (in the Salting collection, for instance), but by far the greater number of the pieces so marked undoubtedly date from the beginning of the eighteenth century. On the other hand, the Chinese books all agree in telling us that this Cheng-hua period was noted for a decline in the excellence of the blue, but on the other hand was pre-eminent for its coloured decoration. It was rather the earlier Hsuan-te period (1425-35) that was renowned for the brilliancy of its blue. These statements of the Chinese authorities are confirmed by an analysis of the Ming specimens illustrated in the Bushell manuscript. The Japanese, perhaps a little more rationally, give the preference to the reigns of Hsuan-te and Yung-lo (1402-24), for the date-marks of these emperors (‘Sentoku’ and ‘Yeiraku’ in the Japanese reading) are to be read on the commonest modern blue and white in domestic use in that country.