Charles Ellicott Commentary Leviticus 13:56

"And if the priest look, and, behold, the plague be dim after the washing thereof, then he shall rend it out of the garment, or out of the skin, or out of the warp, or out of the woof:" — Leviticus 13:56 (ASV)

Behold, the plague be somewhat dark. —But if after the washing the priest finds that the suspicious colour has changed from green or red into a darkish colour, and the spot has contracted, he is to cut out the affected spot and burn it, and declare the garment itself clean. (See Leviticus 13:6.)