Urine-indicator dye is a fictional substance thought to form a colored cloud in a swimming pool to indicate the presence of urine from people urinating while swimming. Rumors of the chemical's existence go back at least as far as 1958, with a 1985 biography of Orson Welles describing 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, the dye does not exist, and although a chemical could be manufactured to react to urine, it would be difficult to prevent it from reacting to other substances present in pool water.
A few companies capitalized on the 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. The signs were a strong deterrent particularly for adults.
- Mikkelson, Barbara (December 14, 2000). "Piscine of the Crime". Snopes. Retrieved September 18, 2012.
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