1)
What are the connotations of the words "Nega ha'Nesek"?
1.
Sifra: It is comparing a Nesek to a Nega, inasmuch as the minimum Shi'ur Nesek, like that of a Nega, is a ki'Geris. and a Nega to a Nesek, in that, just like a Nesek, if a Nega spreads inwards, it is not considered a Pisyon. 1
1
See Torah Temimah, note 137.
2)
Seeing as "Se'or" incorporates green and red hairs (See ha'Torah ve'ha'Mitzvah), why does the Torah add the word "Shachor"?
3)
What are the implications of "ve'Se'or Shachor Ein bo"?