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" ... Everyone starts out with a plain cup of water, which represents an uncontanimated, uninfected body. The phenolphthalein represents a test to see, simply by dropping a single drop in the water, whether the body is infected (if it turns pink) or uninfected (if it stays colorless). And the lye represents the infection: if there's even a small amount of lye in the water, the entire cup will have its pH rise to a level where phenolphthalein turns it from clear to colored. ... "