TT #295 · Parshas Tazria · Aliyah 7 · Passuk 56
English: If the priest examines it and the lesion has faded after it was washed, he shall tear it out of the garment, leather, warp or woof.
Torah Temimah cites Sifra (Toras Kohanim) for applying the same shade distinction to the parallel verse.
Sifra — Vayikra 13, Midrash Sefer
English: The Sifra compares the word “lesion” here with its use elsewhere and applies the same distinction between the second and third shades.
Textual derivation
The same shade distinction applies wherever the parallel term “lesion” is used in this passage.