What is the unique sign of impurity for a netek (as opposed to skin tzara'at)?
Halacha 2 states that netakim contract impurity through two signs: short golden hair (sha'ar tzahov dak) and spreading (pisyon). White hair and michyah, the skin tzara'at signs, do not apply.
Question 2
Two black hairs are found at the edge of a netek. Do they prevent impurity?
Halacha 6 states that black hairs that remain at the extremity of the netek do not prevent it from being classified as impure — they must be in the center of the netek with a two-hairsbreadth margin from the outer hair.
Question 3
What type of golden hair qualifies as a sign of impurity in a netek?
Halacha 4 explains: 'dak' means short. Even if the hair has a golden hue, if it is long, it is NOT a sign of impurity. Only golden hair that is both golden in color and short qualifies.
Question 4
A netek was declared pure due to the growth of black hair. The black hair later fell out. What is the ruling?
Halacha 8 states: once a netek is healed/purified because of black hair, it remains pure even if the black hair disappears — until new golden hair grows or new spreading occurs after the black hair fell out.
Question 5
A netek spreads to cover the entire head. What is the ruling?
Halacha 12 states that if a netek spreads to cover the entire head with no hair remaining (less than two hairs), the person is pure, as Leviticus 13:40 states 'He is entirely bald; he is pure' — whether this occurred during isolation, impurity, or after release.