👉 A trivia fluid, often referred to as a "trivium," is a specialized type of liquid that has been used in various historical contexts, notably in the 18th and 19th centuries for writing documents like wills and legal papers, to ensure the document would not be altered or tampered with. These fluids are typically made from natural substances such as egg whites, casein (a protein found in milk), or gelatin, which create a semi-solid consistency that resists scratching, water absorption, and chemical changes. This makes them ideal for preserving the integrity of important documents over time, a feature that has led to their use in modern applications like security seals and tamper-evident packaging.