The Sawankalok wares of Siam, too, have already had a passing mention. These are easily distinguished by their coarse grey body, reddish at the base, and thin, watery green glaze, very transparent and showing a bluish efflorescence where it has run thick. Once seen, they are hardly likely to be confused with any Chinese celadon, except a few of the coarser Ming and later types, in which the glaze happens to be very pale and thin. The Siamese wares, moreover, usually have a small raw irregular ring under the base, made by the end of a tubular kiln support, and differing from the broad regular ring on the Lung-ch´üan dishes described above. But the most puzzling of the external celadons are those made at various times and places in Japan. They are, as a rule, close and careful copies of Chinese types, with which they are readily confounded by persons not familiar with Japanese peculiarities. In many cases, too, they will puzzle the most expert. It is well-nigh impossible to put into words any distinctive criteria of these wares. The biscuit is usually white and porcellanous, and though it sometimes assumes a natural tinge of red at the base, the colour is not so deep and decided as on the Lung-ch´üan wares. The chief distinction is an inevitable Japanese flavour in the form and decoration of the ware, but this, again, is an intangible feature which can only be realised by the practised eye. Finally, it should be said that remarkably close copies of the celadon green glaze (and of the typical ornament as well) were made in Egypt and Persia in the late Middle Ages. At a short distance they might often be taken for Chinese, but on inspection the body will be found to have that soft, sandy texture which is an unmistakable characteristic of the near-Eastern pottery.