👉 The slave fluid, also known as the slave oil or slave grease, is a viscous, semi-solid lubricant historically used primarily in steam engine and early industrial machinery. It was typically made from animal fat or tallow, which was melted and mixed with mineral oil or other additives to enhance its lubricating properties. The slave fluid served as a critical component in reducing friction and wear between moving parts, ensuring smooth operation and extending the lifespan of machinery. Despite being largely replaced by synthetic lubricants in modern times, the term "slave fluid" remains a historical reference to its pivotal role in the industrial revolution.
