Leviticus 13:54-58

then the priest shall order them to wash the thing in which the mark occurs, and he shall quarantine it for seven more days.

After the article with the mark has been washed, the priest shall again look, and if the mark has not changed its appearance, even if the mark has not spread, it is unclean; you shall burn it in the fire, whether an eating away has produced bareness on the back or on the front of it.

“But if the priest looks, and indeed the mark has faded after it has been washed, then he shall tear it out of the garment or out of the leather, whether from the warp or from the woof;

yet if it appears again in the garment, whether in the warp or in the woof, or in any article of leather, it is an outbreak; the article with the mark shall be burned in the fire.

But the garment, whether the warp or the woof, or any article of leather from which the mark has disappeared when you washed it, shall then be washed a second time and will be clean.”