Two-color letterpress on cotton: what changes when you add a second plate

The jump from one color to two is a bigger event on the press than it looks on screen. Each color needs its own plate, its own ink mix, and its own press pass — and the second pass has to register against the first, on cotton that's just been through the press once and may have shifted by a few thousandths of an inch. That registration is where the craft happens; a well-registered two-color card looks effortless and a poorly-registered one looks like a mistake.

Design implications: give any color that abuts another a hair of overlap (a "trap") so a tiny misregistration doesn't leave a white line between them. Avoid designs that put fine type from one color directly on top of a solid field of another — the register tolerance simply isn't there. Two-color designs that work best keep the colors in separate zones of the card and let the plate depth do the connecting.

The color choice matters more than in offset. Because letterpress inks are translucent, the second color reads truest against unprinted paper. Two dark inks on cream cotton is our most-run specification for two-color letterpress, and it hits every time. Two brights on white cotton is where things get lively — coral and navy, oxblood and forest — and the cotton stock softens the intensity so the card reads editorial rather than loud. Every two-color run gets a hand-pulled proof before we commit to the full run; the registration is what you're paying for.