ויקרא יג:לט פירוש: רש״י וספורנו

כהות לבנות DULL WHITE — It means that their whiteness is not intense but a dull white.

כהות לבנות, below that which appears like the skin of an egg concerning which the sages taught us (Maimonides Tum’at Tzoraat 1,11

בהק A BRIGHTNESS — just like the white which shows itself in the flesh of a ruddy man, who is termed rouge in old French, between his red spots: this is called בהק “brightness” — like a man who is covered with lentil-like spots, when between one lentil-like spot and another the flesh shows bright with a pure brightness.