Commentary for Ketubot 150:5

אבל היכא דליכא חזקה דממונא אזיל רבי יהושע בתר חזקה דגופא דתניא אם בהרת קודם לשער לבן טמא אם שער לבן קודם לבהרת טהור ספק טמא ור' יהושע אומר כהה מאי כהה אמר רבה כהה טהור

When the principle of possession is not applicable R. Joshua does follow the presumption of the body; For it was taught: If the bright spot preceded the white hair, he is impure; if the white hair preceded the bright spot, he is pure. [If the order is in] doubt, he is unclean; but R. Joshua said: It darkened. What is meant by “it darkened”? Rabbah said: [It is as though the spot] darkened [and, therefore,] he is clean.

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