Leviticus 13:37

ושער שחור AND [THERE BE] BLACK HAIR — Whence do I know that this applies also to yellow or reddish hair which also, like black hair here mentioned, are not gold-coloured? Because it states ושער “and hair” (whatever its colour may be) (Sifra, Tazria Parashat Nega'im, Chapter 9 14). The expression צָהוֹב denotes anything like the appearance of gold, and צהוב is equivalent to זהוב, orpàle in old French (English = pale gold). טהור הוא וטהרו הכהן HE IS CLEAN AND THE PRIEST SHALL PRONOUNCE HIM CLEAN — Consequently a person who is really unclean whom the priest pronounces clean is not clean. [It is true that the declaration is left to the priest — as pointed out by Rashi on v. 2 — but if he erred or willfully pronounced the unclean person clean it is of no effect for Scripture states: he is clean and the priest then — and then only — shall pronounce him clean] (Sifra, Tazria Parashat Nega'im, Chapter 9 16).

וְאִם־בְּעֵינָיו֩ עָמַ֨ד הַנֶּ֜תֶק וְשֵׂעָ֨ר שָׁחֹ֧ר צָֽמַח־בּ֛וֹ נִרְפָּ֥א הַנֶּ֖תֶק טָה֣וֹר ה֑וּא וְטִהֲר֖וֹ הַכֹּהֵֽן׃ {ס}        

But if the patch remain stationary in appearance, and there is black hair grown up in it; the patch is healed, he is clean: and the priest shall pronounce him clean.