The worker, as progress is made, may find it inconvenient to be bound by fixed sizes, and the desire may arise to prepare a mount to a size more suitable for the print, and by which it will be helped and set-off. Berlin mounting boards - grey or white - are the most useful for this purpose. Sizes from 7 inches by 5 inches to 15 inches by 12 inches will be found most satisfactory in the substance known as "6-sheet." This class of board will be adapted for use when the print is to be pasted on. If, however, it is thought that the print would look better behind a cut-out opening in the mount, the substance of the board should be "12-sheet" - this allows for a good bevelled margin. The "12-sheet" boards can be bought in large sizes up to 54 inches by 36 inches, but boards half this size, or even less, will be found easiest to handle.
Very effective results may be obtained by facing the mounting boards with tinted papers, which may be bought in various shades of grey, brown, and green, or by superimposing one tint upon another to give margins of varying widths round the print. The blending of tints and arranging of margins must be done with caution. A cold-toned print will be made to appear colder by comparison if mounted upon a warm-tinted (brown) mount, and vice versa. A long, narrow print will be made to appear longer if mounted upon a mount having the margins somewhat extended lengthways instead of the same width as at top and bottom.
The paper is cut the same size as the mount and placed in water to soak.
It must be remembered that paper slightly increases in size by expansion when wetted. During the time the paper is soaking the mount must be sponged over with water. The paper is taken from the water and dabbed with a cloth to dry off the superfluous moisture. The mountant is then applied, and the paper is carefully laid in position on the card and pressed into contact with a cloth, commencing at the centre and working out towards the margins. As the paper dries it will contract and become stretched tightly upon the cardboard, and further than this it will cause it to warp. This may be overcome by applying a piece of ordinary paper to the other side to act asa"Counter Pull."
Cut the mount to the size required from a piece of "12-sheet' cardboard. The size of opening will be regulated by the size of the print. It must, however, be about a quarter of an inch less each way in order that the margins of the print shall be covered. The size of the opening having been decided upon, it is necessary to find the centre of the cardboard; this is done as follows: The mount is represented in Fig. 47. A, B, C, and D are the corners; to find the centre lay a rule across from A to D, make a pencil mark about an inch or so long near where it is thought the centre will come; then draw a similar line after laying the rule across from B to C. The centre will be where the lines cross. Through the centre draw a line parallel with A B, and one crossing it parallel with B D. Upon these two last lines the measurements for the opening are set out. Supposing the opening is to be 6 inches long by 4 inches wide: for the length 3 inches should be measured off on either side of the centre on the horizontal line, and for the width 2 inches on either side on the vertical. Faint pencil lines drawn through these points will give the outlines of the opening E F G H, upon which the cutting-guide will be laid.
The cutting-guide is made from hard wood, and should be from 18 to 24 inches long and have one edge bevelled to an angle of 45 degrees, and the other a straight edge. The dotted lines shown at C give a sectional view of the guide. The card must lie upon a piece of zinc, and upon it the cutting-guide with the bevelled edge to the pencil line E F. The cutting-knife is laid flat upon the bevel of the guide with its point on the card at F. Hold the whole firmly in position and make a strong cut along the line to E. Repeat until the card is cut through. Do this on each of the lines, and the portion may be removed. The corners may require a little trimming out.
If the cut-out mount is to be faced with tinted paper, it is done in the same way as the plain mounting board. When the paper has been attached to the card the whole is turned over on its face on the zinc. A portion of the paper is cut away as indicated by I J K L. Further cuts are made at the four corners, as E to I, and so on. The paper is then folded back upon the mount as shown at F H. This is done all round; it is then pressed into contact. The print is first mounted on an ordinary plain mount, and afterwards glued behind the opening of the cut-out mount.