Which border color distinguishes a visa from a passport card?

The distinctive border color that separates a visa from a passport card is gold. The gold border on a passport card is designed to visually differentiate it from regular passports and other travel documents. This color-coding system is important for quick recognition at border checkpoints and by authorities, ensuring that the specific type of document can be easily identified under various conditions. Both documents are essential for international travel, but their different purposes and forms necessitate a clear visual distinction, with the gold border serving that purpose effectively. Understanding these visual identifiers is crucial for individuals working in border patrol and customs enforcement, as it aids in identifying and processing travelers efficiently.