If the priest sees that the area is pale after washing, he will tear it out of the clothing or the leather.
that is woven or knitted from linen or wool or on any leather article,
The priest will examine the area again after it is washed. If it doesn’t look any different and the mildew has not spread, it is still unclean. It must be burned, whether the area is on the outside or the inside.
However, if it shows up again, you must burn the clothing or the leather article.