Meaning
Chemical degradation processes occur when light exposure breaks down the molecular structure of pigments and dyes used in product packaging or labeling. Through print ink photolysis, the visual quality of the printed information deteriorates, leading to faded colors and unreadable text. This process governs the long-term legibility of branding and regulatory information on packages exposed to natural or artificial light.
It ceases to progress once the package is shielded from light sources.
Packaging Compliance
Manufacturers of packaged consumer goods must select inks that resist this degradation to ensure that important product information remains legible throughout the product’s life. When print ink photolysis affects regulatory warning labels or barcodes, the product may become non-compliant with retail and safety standards. This risk forces manufacturers to specify light-resistant ink formulations in their packaging contracts.
These specifications protect the brand’s retail presence.
Contractual Liability
Distribution agreements often contain clauses that hold the packaging supplier liable for product recalls or rejections caused by ink degradation. If print ink photolysis occurs before the guaranteed shelf life expires, the supplier must compensate the distributor for the cost of repackaging or replacing the affected items. These contracts define the standard light-exposure tests that the packaging must pass before approval.
This liability clause protects the distributor from low-quality materials.
Quality Control
Quality assurance teams use laboratory light chambers to test ink durability against accelerated UV exposure. These tests measure the rate of fading and help select the best protective coatings for the packaging. This testing ensures that labels remain readable under store lighting.
