First proofs from composed types are taken for the purpose of correcting any errors. Later proofs are for verifying corrections and to note whether instructions have been followed in make-up and in various other matters necessary to get the type ready for printing.

Proofs are sometimes taken by using a proof planer and mallet, but more commonly by means of a proof press.

In any of the usual methods employed it is first necessary to spread ink on the type face with an ink roller. A small hand roller is used in combination with a smooth steel or stone surface on which to distribute the ink. The composition of the roller should be well seasoned and the roller should be well cleaned. A good grade of slow-drying black ink of the quality known as “book” ink is necessary for the usual work. A very thin ink or a very stiff ink is not suitable. The amount used should be just enough to give a clear impression of the type, and no more. This is graduated to the lightness or boldness of the face, and also to the finish of the paper. A glossy coated paper will need less ink than a machine-finish paper; while an antique-finish paper will need much more ink than either. As a general rule, proofs are made on smooth-finish paper with a minimum quantity of moderately stiff ink.

A proof planer is a block of wood about 8inches long by 31/2inches wide and 21/2inches high, having its face covered with a piece of thick cloth or felt. A planer proof must be made while the type is on the imposing stone or some other solid surface. When ink has been rolled on the type a sheet of thin paper, slightly damp, is laid on the type and the planer is used for taking the impression. The sheet should be dampened evenly all over with a sponge, enough to be a little limp. The unsponged side of the sheet is laid on the type very carefully to avoid slurring the impression. The proof planer, held in the left hand, is placed steadily on top, and a mallet in the right hand is used to tap the planer. If the planer does not cover the whole page, it must be lifted from one part to another until the whole surface is covered. This requires some practice, to avoid a shifting of the sheet on the type and making a double or smeared impression.

A firm foundation for the type and a steady blow, graduated in force to the size of the printing surface, are necessary for a clean impression. The mallet should hit straight, without glancing sidewise, and the planer should be held level and steady.

The kind of type forms adapted for proving by this method are those with paragraphs of plain matter and strong faces which will not be easily battered. Those with large open spaces and small lines, and those with delicate lines like scripts and kerned italic letters, should not be proved with a planer if another method is available. Small groups of type standing alone, like page numbers and small imprints, require very careful treatment in proving, to avoid unnecessary impression which may batter the face or break off the kerns. When it becomes necessary to take proofs of fine or small types standing without surrounding support, it is a good plan to place near the type, on two sides if possible, type-high blocks upon which the planer may rest while the impression is being tapped.

The proof planer is not the common method of taking proofs, but is employed in places where there is no regular proof press, and also under conditions where a proof press cannot readily be used. The latter condition is in the case of a large form beyond the capacity of the proof press, locked up on the imposing stone, when a proof is required, either of a part or of the whole, for verification of some detail before sending the form to press for printing.

The other and more common method of taking proofs is on one or another of the several kinds of proof presses, as described in text-book No.5 of this series, “Proof Presses,” to which the reader is referred for a detailed consideration of the subject.