Cold Foil on Dark Printed Backgrounds / 深色底印刷上冷烫为什么发暗
## Quick Answer Cold Foil on Dark Printed Backgrounds should be specified by process route, substrate, adhesive or UV varnish compatibility, artwork detail, and finished-package durability. For packaging designers, the safest buying path is to test the foil on dark printed cartons and labels, using the actual machine route for black, navy, and deep-color premium packaging. The main purchasing risk is opacity, foil brightness, overprint sequence, and contrast. Do not approve a cold foil roll by color alone; approve it by transfer completeness, edge clarity, gloss, adhesion, rub resistance, an…