Preparing Artwork for Foil Stamping

Clean foil art saves time at every step: die engraving, make-ready and the run itself. Most foil problems trace back to file prep, not the press. The guidelines below reflect general industry practice. Specifics vary by foil, die type and stock, so confirm them with your finisher before releasing artwork.

Build the foil as its own vector layer

• Supply foil elements as 100% solid vector artwork on a separate layer, in a named spot color (for example "FOIL_GOLD"), set to overprint so it does not knock out the print.
• Use one spot color per foil. Two foils on one job usually means two dies and two passes.
• Convert type to outlines and expand strokes so nothing depends on fonts or stroke settings at the die maker.
• Avoid gradients, tints and halftones in foil art. Foil is either on or off.
• Name layers and spot colors after the process they drive (FOIL, EMBOSS, DIELINE, SPOT_UV). Clearly labeled files move through prepress faster and with fewer questions.

Line weights, detail and registration

Fine lines and tight counters are the most common source of fill-in and breakage. As general guidance, many finishers suggest keeping positive lines no thinner than roughly 0.5 pt to 1 pt, and keeping reversed lines and spaces heavier than that, since foil tends to bridge small gaps. Small serif type, hairline rules and fine patterns all need extra attention. Large solids bring their own risk: broad flat coverage can trap air and show pinholes or uneven transfer. When foil sits next to or on top of printed elements, build in tolerance. Trap printed color under the foil edge rather than butting the two, and avoid designs that depend on perfect alignment of a thin foil outline around a printed shape. Some sheet-to-sheet variation from press registration and paper stretch is normal, and the file should allow for it.

Other checks before release

• Coatings: knock out aqueous or UV coating where foil will stamp unless the foil is rated for that coating.
• Stock: confirm the foil is compatible with the substrate, laminate or soft-touch surface.
• Folds and scores: keep foil off crease lines where possible, since foil can crack when folded.
• Proofs: provide a separated PDF showing foil only, plus a composite showing its position against print.

Before you release plates, send the files to C&H for a review. We can flag line weights, trapping or coating conflicts while changes are still easy to make.