Cold Foil Dull Gloss: Varnish and Pressure Diagnosis / 冷烫光泽发暗如何判断光油和压力问题
## Quick Answer Cold Foil Dull Gloss: Varnish and Pressure Diagnosis should be specified by process route, substrate, adhesive or UV varnish compatibility, artwork detail, and finished-package durability. For QC teams, the safest buying path is to test the foil on UV varnish, coated paper, and film labels, using the actual machine route for high-gloss metallic packaging. The main purchasing risk is varnish leveling, foil contact, and pressure uniformity. Do not approve a cold foil roll by color alone; approve it by transfer completeness, edge clarity, gloss, adhesion, rub resistance, and rep…