CHAPTER VIII.
PROVING AND PRINTING.
85. Wax Proofs.—Our first desire, after the ground has been removed from the plate, is to see a proof. If you have no press, and yet desire to take proofs of your work after each biting, you may employ the following process to good advantage:—
Take a sheet of very thin paper, a little larger than your plate, and cover it with a thin layer of melted wax. The latter must be real white wax. Then sprinkle a little lamp-black on your engraved plate, and distribute it with your finger, so as to rub it into the lines; clean the surface of the plate by carefully passing the palm of your hand over it. Now lay the sheet of paper on the plate, with its waxed surface down, and be sure to turn the edges of the paper over on the back of the plate, so as to prevent its moving; then rub with the burnisher in all directions. The lamp-black sticks to the wax, and is sure to give an approximate image, sufficient to guide you in the further prosecution of your work, if that should be necessary[20]
86. The Printing-Press.—These proofs, however, as well as those which were hurriedly printed for you so far, give only a mere idea of your work, without conveying its full meaning. If you desire to become acquainted with all the resources of the printing-press, you will have to go to a plate printer. It is well worth your while to acquire this knowledge, also, after you have familiarized yourself with the various processes at the command of the etcher.
Here, then, is the printer at his press: at his side there is a box made of sheet-iron, enclosing a chafing-dish; there are also printing-ink, a ball for inking, rags, and paper.[21] He is about to explain the use made of these things to our young student, who delivers his plate to him, and is anxious to be instructed in all that relates to the taking of impressions.
87. Natural Printing.—The printer now begins his explanations as follows:—
I place the plate on the sheet-iron box (the plate-warmer); it there acquires the necessary degree of heat, and I then spread the printing ink over it by means of this ball; the ink penetrates into the lines, and completely covers the whole surface of the plate; I remove the excess of ink with a coarse muslin rag, precisely as this is done in all other kinds of plate printing; I now clean the plate with the palm of my hand, so that no ink is left on it anywhere but in the lines; I finally wipe the margins of the plate evenly, so as to leave a delicate tint on the etched part only, and then I put the plate into the press. The plate is laid on the travelling-board or bed of the press, which runs between two cylinders of iron or hard wood; on the plate I lay a piece of paper, slightly moistened, and I cover the whole with several thicknesses of flannel; I turn the wheel of the press, and the cylinders, turning on themselves, carry along the travelling-board, which, in passing between them, is subjected to great pressure. The paper is thus pressed into the lines on the plate, and this process is facilitated by the elasticity of the flannel. You see now that your plate has come out on the other side of the rollers (or cylinders): we have given the press only one turn, although, as a rule, the plate is passed through the press twice, by making it travel back again under the rollers. This imparts strength to the impression; but occasionally the lines are not rendered as delicately and with as much precision, as with only one turn. I remove the flannel, and very carefully lift the paper; it has absorbed the ink: we have before us a natural proof, which shows the exact state of the plate (see [Pl. I.]). Line-engravings are printed in the same manner; with this difference, however, that the tint, more or less apparent, which is preserved on an etching, is not allowed to remain on a plate engraved with the burin.