The proofs, therefore, of the _niellatori_ on paper are to be found in all parts of Italy, and they may be particularly known from the position of the letters, which being written on the original models in the ordinary way, appear in the impression like the eastern characters, from right to left; and in like manner the other part of the impression is seen in reverse; as for instance, a saint is seen standing on the left hand, who, from his dignity, ought to have occupied the right, and the actors all write, play music, and do every thing with the left hand. There are other signs which serve to distinguish them; because, having been pressed by hand, or with a roller, they leave no mark or furrows in the outlines; nor are we to look for that delicacy and precision in the lines that appear in impressions from under the press. They are moreover characterized by their colour, which merely consisted of lamp black and of oil, or of some other very slight tint; though both this and the preceding are dubious signs, as we shall shew. It is conjectured that proofs of a similar[98] nature were made by silver carvers, in regard to their graphic labours, and to others in which the _niello_ was not employed. At all events they preserved them in their studies, and in those of their pupils, to whom they afforded a model; and in this way several have been handed down to our own times. From these early efforts, the art gradually advanced, as it appears to me, until it attained what I call the second state of the impression. When the pleasing effect of these proofs was seen, the idea was struck out, of forming works in the same delicate and finished taste, and for this purpose to make use of the same means as had been until then adopted for impressions in wood. We might thus observe, that in the workshop of the goldsmith was prepared the art of chalcography, and the first labours were executed upon silver, upon tin, or, as Heineken observes, upon some composition less hard than copper. We may remark, that such was the practice of the Italians, before they cut their subjects in copper; but whatever material the first goldsmiths might adopt, it was not difficult for them to substitute for the shadow they produced by the _niello_, the shadow of the cut itself, and to execute the subject on the reverse, in order to receive the impression right. From that time, they proceeded gradually to refine the art. Both the roller and the press which they had then in use were very imperfect, and, to improve the impression, they first enclosed the plate in a frame of wood, with four small nails to prevent its slipping; upon this they placed the paper, and over it a small moist linen cloth, which was then pressed down with force. Hence, in the first old impressions, we may plainly trace on the reverse the marks of the linen, for which felt was next substituted, which leaves no trace behind it.[99] They next made trial of various tints; and gave the preference to a light azure or