Dated specimens have an exceptional interest in proving that no inconsiderable progress had at that time been made in the artistic development of the factory. Already in form and in decoration there was something distinctive in Müller's ware. Such pieces show indisputably that great days were at hand, if indeed in these first few years success had not already been achieved in training artists and craftsmen in the new industry. =Müller's Technique.=--Danish ceramic art is profoundly indebted to Müller for his pioneer work. He was a giant in days when pigmies controlled the destinies. His unflagging energy, his practical experiments, and his original and inventive genius impelled him to implant national characteristics in the Royal Copenhagen porcelain which have never departed from the ware of this factory. His first attempts were made with kaolin which he obtained from the island of Bornholm. He soon realized that this did not fulfil all the conditions necessary for a fine body. It was of a greyish-blue tint, and was liable to lose its shape in firing. In appearance it is not very transparent and is somewhat coarse, like some of the old Japanese porcelain. Of this Bornholm period mention will be made later in dealing with the early examples of blue underglaze painted ware, which is a special variety by itself, running concurrently with the overglaze painted ware which Müller brought in his best period to unexampled perfection. He prepared the glazes himself, determined the correct method of firing, and made the colours used at the factory. The blue that he invented is perfect, and is to be found on the early specimens of underglaze painted porcelain for domestic use. The green and the purple found in the early Müller period were his own discovery and of exceptional quality in tone. He was a master of technique, and perfected a new body which he called "virgin paste." This is of a dazzling white, and Müller's glaze is transparent and smooth as polished crystal. The tint is that of the green of the sea, and without doubt its technical excellence lends great beauty to the porcelain of this period. Considering the primitive methods of working and the impure materials then available, the perfection and beauty of the results claim profound admiration from the connoisseur. Even with the aid of modern technology and chemistry it has not yet been found possible to equal the technique of Müller's best period.