DODGING.
This is clone in the same way as described in the section on Preparation of the Nega tive for Printing, except that the shade card must be cut out and attached to the frame with drawing-pins. This is then covered with tissue paper, and exposed (the extra exposure required by certain parts having been estimated) for the neces sary time. The masking is then removed, and the negative again exposed.
be modified. This can be effected in two ways: (1), by varying the distance from the light, and (2) by altering the strength of the. light. When working on the board the first method is employed, and with the box the second. In varying the intensity of light, this should not he done by turning it up and clown, but by interposing tissue paper between it and the negative. If, for example. the negative is harsh, it, should as far as possible be printed with clear glass. If. on the other hand, a negative is weak in contrast, with the shadows clogged by over exposure, then by printing through tissue paper the contrasts may be greatly strengthened. At the same time, however, it must be borne in mind that this softens the outline (see page 217), and that as a consequence the contrasts are not so great duced, and expose as above. Then open
the frame, and mark the back of the print in outline (see Fig. 331), putting a cross on the part not' printed. Now lay clown, in a larger frame, the sky negative, or that with the new figure, and mask all except. that which is to print carefully from the front. This must be clone not with sharp outlines, but with a vignetted effect, by means of cotton-wool, as shown in Fig. 332. The paper is now fitted over, and the second exposure made. It will be under :,tood that each time the frame is covered with tissue paper T. A frame several sizes larger than the negative should be used for printing in skies, and, if this is not possible, the plan suggested on p. 161 must be adopted ; or if using the box and electric light it can he very conveniently clone on the top. For further information on com bination printing, see the section on Pre paration of the Negative for Printing.