Why does my card look different under different types of light?

The card uses security inks and holographic layers that react specifically to 365nm UV light and direct overhead lighting for visual authentication. This light-interactive design is intentional and mimics the security philosophy of official identification cards. Under indoor fluorescent lighting, the card looks like a standard printed document, but under direct sunlight or a spotlight, the holographic seals become visible. When exposed to a 365nm blacklight, the invisible UV phosphors in the ink are excited and glow in vibrant colors. This allows for multi-layered security where different information is visible depending on the light source used. For example, the OVI (Optically Variable Ink) requires a single point of light to show its color-shifting properties. This complexity is what makes the card realistic; a card that looks the same in every lighting condition is an immediate sign of a low-quality, non-scannable prop.