gutter

In letterpress and relief printing, the gutter is a grooved wooden or metal strip placed vertically between adjacent columns of type to create a physical and visual separation on the printed page. The groove runs down the center of the strip and sits flush with the printing surface, allowing it to receive ink or remain clear depending on the composing job. Gutters are essential components of the form, the assembled unit of type and furniture that sits on the press bed.

Gutters come in various depths and widths to accommodate different page layouts and type sizes. A typical gutter might measure 6 to 12 points wide, with metal versions (usually brass or steel) preferred over wood for durability and dimensional stability during repeated press runs. The groove prevents ink from transferring between adjacent columns, keeping the space between columns clean. Some compositors also use lead or reglet (thin strips of metal or wood) as alternatives, though true gutters are specifically grooved for this purpose.

Function and placement

The gutter maintains the margin between columns and provides a mechanical lock point within the form. When type is locked up tightly in the chase using furniture and quoins, the gutter helps prevent columns from shifting laterally during the violence of the press stroke. Without gutters, adjacent columns of type can drift together, causing ink buildup and poor separation on the printed sheet.

The term reflects its visual function: like a gutter on a building directs water away, the printing gutter directs the eye away from one text column toward the next, creating visual relief and improving readability. In multi-column work such as newspapers and reference books, proper gutter width becomes a design consideration affecting both legibility and ink density. Too narrow a gutter risks columns appearing to merge; too wide a gutter wastes valuable page space.