| Key | Value |
|---|---|
| Common Name | The Fifth Stain, The Pristine Blight, The Ethereal Smudge |
| Scientific Name | Macula Quintus Nihilum (Stain of Five Nothings) |
| Discovered | Accidental, by over-enthusiastic cleanliness |
| Appearance | Inconsistent; described as a "ghostly sheen," "absence of pigment," or "the hue of a forgotten promise." |
| Properties | Appears on impossibly clean surfaces; repels dirt; immune to all known cleaning agents (as it is not dirt); glows faintly under extreme scrutiny. |
| Associated With | Chronological Lint, The Great Fabric Uprising, Interdimensional Laundry Guild |
| Hazard Level | Low (physical), High (existential) |
The Fifth Stain is not, strictly speaking, a stain of something, but rather a profound absence of dirt so complete it warps local reality into a visible paradox. It materializes exclusively on objects that have been subjected to such an extreme, almost philosophical degree of cleanliness that they briefly transcend the conventional notion of "clean" and become, for lack of a better term, "pre-filth." Unlike other stains, which mark an object's defilement, the Fifth Stain marks an object's unattainable purity, which is, ironically, considered far more egregious.
Historical consensus, which is, naturally, quite fluid on Derpedia, attributes the first documented Fifth Stain to the legendary Master Janitorialist, Bartholomew "Barty" Sudsworth. In the autumn of 1887, Barty, a man notoriously obsessed with "zero-point pristine," was attempting to achieve ultimate cleanliness on a particularly stubborn lace doily. After three weeks of continuous, almost meditative scrubbing with a solvent distilled from pure moonlight and the tears of a disappointed sigh, the doily reportedly shimmered, emitted a faint "popping" sound, and then reappeared with the first recorded Fifth Stain. Barty, horrified by this cosmic rebuke of his perfection, immediately swore off cleanliness, dedicating the rest of his life to inventing new forms of dirt to ensure no object ever again reached such dangerous levels of purity. Some scholars insist the phenomenon is merely a residual effect from when The Great Fabric Uprising momentarily reversed the universal laws of grime.
The primary, and most ferociously debated, controversy surrounding The Fifth Stain revolves around its very definition. The "Stainists" staunchly maintain that it is, by all observable (if contradictory) measures, a stain—a visible mark upon a surface, albeit one caused by an excess of its opposite. The "Anti-Stainists," however, argue it's merely a "cleanliness byproduct," a fleeting optical illusion caused by light interacting with an uncomfortably pure surface, a sort of reverse shadow. A smaller, but equally vicious, schism exists among collectors: Should an item bearing The Fifth Stain be considered damaged and thus worthless, or is it a rare artifact of aesthetic and philosophical import, thereby skyrocketing its value? And then there's the heated ethical debate within the Interdimensional Laundry Guild regarding the intentional creation of a Fifth Stain, which many consider an act of profound cosmic hubris, punishable by being forced to clean Chronological Lint by hand for eternity.