When customers receive necklaces that have turned black or oxidized, it often undermines their trust in the product. As a professional manufacturer deeply rooted in the jewelry packaging industry, Jinyu Packaging combines years of experience to analyze oxidation causes and solutions from four key dimensions:
The Core Impact of Electroplating Layer Technology
The primary cause of necklace oxidation may stem from an insufficient thickness of the electroplating layer. Qualified electroplating processes must meet industry-standard thickness (e.g., 18K gold plating ≥2.5μm). If the plating is too thin, the metal substrate easily contacts air and moisture directly, accelerating oxidation and blackening. It is recommended that brands strictly inspect electroplating layer test reports to control anti-oxidation capabilities from the source.
The Hidden Risks of Packaging Materials
If the inner tray of a jewelry box uses sulfur-containing flannel or low-quality linings, sulfides released by the materials will react chemically with metals like silver and copper, causing the necklace surface to blacken rapidly. Jinyu Packaging uses eco-friendly, certified sulfur-free flannel, cutting off the sulfide erosion path at the material source. Tested and certified by SGS, the sulfur content is ≤0.01%, suitable for all types of precious metal jewelry.
Detailed Control of Production Processes
Glue Odor Volatilization Treatment
If the glue used in jewelry box assembly is not fully volatilized, residual organic gases (such as formaldehyde and benzene compounds) will accelerate metal oxidation. Jinyu Packaging strictly implements a "72-hour ventilation" standard, storing products only after the glue is completely cured and odors dissipate. Tests show this reduces oxidation risk by 40%.
Dry Packaging Environment Specifications
During packaging, humid air and finger oils act as oxidation catalysts. We require operators to wear powder-free finger cots, maintain a constant temperature and humidity in the packaging workshop (humidity ≤45% RH), and monitor environmental dryness in real time with desiccants, eliminating oxidation caused by human contact and environmental moisture.
Upgraded Protection of Sealed Packaging
If a necklace is not sealed after packaging, oxygen and sulfides in the air will still slowly erode the metal surface. Jinyu Packaging provides a "three-layer sealing solution":
Inner tray layer: Embedded with moisture-proof beads or anti-oxidation paper;
Middle packaging layer: PE sealing bag + oxygen absorber combination;
Outer packaging layer: Sealing rubber strips added to the edges of the two-piece box.
Tests show that sealed packaging can extend the jewelry oxidation cycle to over 6 months, effectively preserving the bright texture upon unboxing.
Jinyu Packaging’s Anti-Oxidation Commitment
From collaborative control of electroplating processes to full-process packaging protection, we provide brand clients with anti-oxidation solutions from source to delivery, adhering to three principles: "environmentally friendly materials, standardized processes, and sealed packaging." Every package undergoes a 48-hour simulated transportation oxidation test to ensure that the jewelry received by customers always maintains its original luster.