There are [laws] that apply to white hair that do not apply to spreading, and there are [laws] that apply to spreading that do not apply to white hairs. For white hair makes [the diseased patch] impure initially and makes it impure with any appearance of whiteness and has in it no [corresponding] sign of purity. There are [also unique laws] by spreading, for spreading makes it impure with any amount, and makes any Nega [diseased patch on skin, clothes, or houses that creates impurity] impure, [as well as if it spread] outside the Nega, which is not true by white hair.

There are [laws] by a healthy patch of skin that spreading does not have, and there are [laws] by spreading that a healthy patch of skin does not have. For a healthy patch of skin makes [the Nega] impure initially, and makes impure with any appearance, and has in it no [corresponding] sign of purity. There are [also unique laws] by spreading, for spreading makes it impure with any amount, and makes any Nega impure, [as well as if it spread] outside the Nega, which is not true by a healthy patch of skin.

There are [laws] by white hair that a healthy patch of skin does not have, and there are [laws] by a healthy patch of skin that white hair does not have. For white hair makes [the Nega] impure if it was in [the area of] a boil or burn, [if the hair was] concentrated or scattered, [if it was] surrounded [by the Nega] or not surrounded. There are [also unique laws] by a healthy patch of skin, for a healthy patch of skin makes a Karachat [Nega that balds the back of the head] or Gabachat [Nega that balds the top of the head], whether [the patch] was preexisting or not preexisting, and it prevents [purification of] someone who has turned completely white [by a Nega] and makes impure with any appearance, which is not true by white hair.

Two hairs whose roots are black and tips are white are [still] pure. [Two hairs] whose roots are white and tips are black are impure. How much whiteness [is required]? Rabbi Meir says: Any amount. Rabbi Shimon says: [Enough] to be able to cut [them] with scissors. If [the hair] was one at the bottom but it split at the top and looks like two, it is [still] pure. A Baheret [type of diseased patch that creates impurity] in which there is white hair or black hair is impure, [because] we do not worry lest the area of the black hair reduced the [total area of the] Baheret [and made it smaller than the minimum size] because it does not have significance.

A Baheret like [the size of] a bean [which is the minimum size of a valid Nega] and a string [of expanded Nega] extends out of it, if it has the width of two hairs, it is obligated [in the laws of impurity] with regards to white hair [in it] and [further] expansion but not [regarding] a patch of healthy skin. Two Baherot and a narrow strip extend from one to the other, if it has the width of two hairs, he combines them [to form one Nega]. And if not, he does not combine them.

A Baheret like [the size of] a bean in which there is a healthy patch of skin like [the size of] a lentil and there is white hair inside the patch, [if] the patch of healthy skin goes away, it is [still] impure because of the white hair. If the white hair goes away, it is [still] impure because of the patch of healthy skin. Rabbi Shimon calls it pure, because the Baheret has not changed it [into becoming white]. A Baheret [in which] it and its patch of healthy skin [together fill an area] like a bean, and there is white hair in the Baheret, [if] the healthy patch goes away, it is [still] impure because of the white hair. [If] the white hair disappears, it is [still] impure because of the healthy patch. Rabbi Shimon calls it pure, because the Baheret [that fills an area] like a bean has not changed it [into becoming white]. But [Rabbi Shimon] agrees that if the area of the white hair is like a bean, it is impure.

A Baheret in which there is a patch of healthy skin and an expansion, [if] the patch of healthy skin goes away, it is impure because of the expansion. If the expansion goes away, it is impure because of the patch of healthy skin. The same [applies] if it had white hair and an expansion. If [the Nega] goes away and comes back at the end of the week, it is treated as if it was [there the entire time]. [If it returned] after it was exempted, it should be seen as if it was the first [time]. If it was bright and became dull, [or] dull and it became bright, it is treated as if it was [there the entire time] as long as it does not become less than the four appearances [of a Nega]. If it contracted [during the quarantine time] and [then] expanded [before the priest called it impure], or expanded and [then] contracted, Rabbi Akiva calls it impure and the Sages call it pure.

A Baheret like [the size of] a bean that expands [the size of another] half a bean but the original [Nega area] is diminished by half a bean, Rabbi Akiva says: It should be seen as if it was the first [time]. But the Sages call it pure.

A Baheret like [the size of] a bean that expands [the size of another] half a bean and more but the original [Nega area] is diminished by half a bean, Rabbi Akiva calls it impure and the Sages call it pure. A Baheret like [the size of] a bean that expands [the size of another] bean and more, but the original [Nega area] disappears, Rabbi Akiva calls it impure. But the Sages say: It should be seen as if it was the first [time].

A Baheret like [the size of] a bean that expands like a bean [and] the expansion develops a healthy patch of skin or white hair but the original Nega goes away from it, Rabbi Akiva calls it impure and the Sages say: It should be seen as if it was the first [time]. A Baheret like [the size of] half a bean and there is nothing in it, [if another] Baheret [the size of] half a bean develops and there is one white hair in it, behold this [person] must be quarantined. A Baheret [the size of] half a bean with one [white] hair in it, [if another] Baheret [the size of] half a bean with one hair develops, behold this [person] must be quarantined. A Baheret [the size of] half a bean with two [white] hairs in it, [if another] Baheret [the size of] half a bean with one hair develops, this [person] must be quarantined.

A Baheret like [the size of] half a bean with nothing in it, [if another] Baheret [the size of] half a bean develops with two [white] hairs in it, it is decided [that he is impure] because they [the Sages] said: If the Baheret preceded the white hairs, it is impure. But if the white hair preceded the Baheret, it is [still] pure. If [a case is] unclear, it is impure. But Rabbi Yehoshua declared [the matter] unsolvable.