Leviticus 13:55

And the priest shall examine the diseased thing after it has been washed . And if the appearance of the diseased area has not changed , though the disease has not spread , it is unclean . You shall burn it in the fire , whether the rot is on the back or on the front .

After the article has been washed, the priest is to examine it again, and if the mold has not changed its appearance, even though it has not spread, it is unclean. Burn it, no matter which side of the fabric has been spoiled.

And the priest shall look on the plague, after that it is washed : and, behold, if the plague have not changed his colour, and the plague be not spread; it is unclean; thou shalt burn it in the fire; it is fret inward, whether it be bare within or without.