Urine-indicator dye is a fictional substance which is supposed to be able to react with urine to form a colored cloud in a swimming pool, thus indicating the location of people who are urinating while they are in the pool. Rumors of this chemical's existence go back at least as far as 1958. A 1985 biography of Orson Welles describes such a dye as existing in 1937, and references to the substance can be found through popular culture over quite a lengthy time period. However, such a dye does not exist, and although a chemical could be manufactured that would react with urine, it would be difficult to prevent it from reacting to other organic substances present in pool water.
A few companies capitalized on this urban legend by creating professional pool signs that warned that the pool was indeed being monitored with the chemical called "wee alert" or a similar catchy name.
- Mikkelson, Barbara (December 14, 2000). "Piscine of the Crime". Snopes. Retrieved September 18, 2012.
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