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How can you work in packaging design without knowing silver and gold cardstock? This inherently premium material can instantly elevate your design to a whole new level. But how do you select silver cardstock, print on it, and avoid common pitfalls? ## 1. What is silver cardstock, and why is it more widely used than gold cardstock? Silver and gold cardstock, as the name suggests, are papers coated with a metallic finish. The silver variant is known as silver cardstock, while the gold one is gold cardstock. Despite the "gold" in its name, silver cardstock is used far more frequently in practical production. Why? Silver cardstock can be printed with any colour. Gold cardstock, by contrast, is generally only suitable for fully gold packaging. Printing complex colours on gold cardstock tends to cause colour shift and muddy tones, yielding unsatisfactory results. Simply put, silver cardstock is made by adding a silver metallic coating onto base white cardstock. It therefore reta...

  Ink adhesion is one of the most core basic indicators for measuring printing quality, which directly determines the scratch resistance, chemical resistance, weather resistance and service life of the ink layer. The industry generally adopts the cross-cut test method (ASTM D3359) for quantitative determination: Level 0 (no peeling) is the best, Level 1 (peeling ≤5%) is qualified, and Level 2 and above belong to adhesion failure, which will directly lead to product scrapping, customer complaints and productivity loss. In actual production, insufficient adhesion is rarely caused by a single factor, and is often the result of the superposition of multiple variables of substrate, ink, process and environment. This paper systematically disassembles the failure mechanism from four dimensions, and provides implementable response and investigation schemes. I. Substrate End: The "Innate Foundation" of Interface Bonding The substrate is the carrier for ink adhesion, and the interface...