The calotypes have the advantage, over the daguerreotypes, of hue and natural position. The tint is warm and by no means unpleasing; it resembles somewhat that of a proof on India paper, though more of a bistre colour; and the relation of feature is true to the beholder. The calotype portrait is not the first effect, as in the daguerreotype, wherein the face is changed from right to left and from left to right. The result of the camera-process on the prepared paper is a black imperfect smudge, scarcely shewing the slightest resemblance to the sitter, and possessing a faint outline of form or feature. But this darkened skeleton, pressed down on other metal-washed paper by a plate of glass, permitting and stopping here and there the passage of the solar rays, is filled out to a full and faithful portrait on the surface of the receiving calotype.