Inference: Here it connotes that our ink is called "Deyo", since it says a stick of ink, which connotes that it is dry.

Pesak: R. Tam forbids writing a Sefer Torah with ink of gallnuts, for it is always moist.

Reference: This is explicit in Gitin (19a).

Assertion: The text says "Rabah", for Rava was expert [about blood], like is proven below in the episode with Ifra Hormiz.

Remark: Rashi explained below that a miracle occurred [for Rava, that he knew the different kinds of bloods. If so, the text can say Rava!]

Rejection: A miracle occurred only at the end [regarding lice blood], like is proven below.

Implied question: Why did other Chachamim inspect blood?

Answer #1: They were not so stringent [to be concerned lest they permit Tamei women].

Answer #2: Perhaps they were exceedingly expert. (Tosfos ha'Rosh - based on what they saw, they could tell if the first drop was Tamei.)

Inference: She did not normally show to her husband, Rav Nachman.

Explanation #1: Perhaps he was not expert.

Implied question: Above (19b), Rav Nachman said that red [like blood of a wound] is like blood of bloodletting. (This shows that he was expert!)

Answer: He had a tradition [that it is like blood of bloodletting. He was not expert.]

Explanation #2: She [did not show to her husband] lest he be stringent and refrain, and not rely on his Chachmah.

Explanation #3: She did not want to be disgraced in front of him.

Suggestion: [She did not show to him because] one may not inspect his wife's blood.

Rejection (Citation - Nega'im 2:5 - Mishnah): One may see any Tzara'as, except for his own. R. Meir says, one may not see even his relatives' Tzara'as;

Citation (cont.): One may permit any vows, except for his own. R. Yehoshua says, one may not permit even his wife's vows. (This refers to retroactively uprooting it through regret. Some vows a husband may annul from now and onwards on the day he hears them.)

Inference: It did not teach that one may see any blood, except for his wife's!

Explanation #1: The simple meaning connotes that this is why he believed her words. However, if not [for her words], he would not permit, even though he relied on his tradition.

Objection: In Chulin (49a), it says about a needle found in the great chamber of the liver that Huna Mar brei d'Rav Idi ruled that it is Tereifah, and Rav Ada bar Minyomi was Machshir (purely due to his tradition)!

Explanation #2: Now we retract from the first answer. When he relies on his tradition, he may permit, even if a Chacham already forbade.

Question: How could Yalsa do so? It says in Avodah Zarah (7a) that if one asked a Chacham and he was Metamei, [the asker] may not ask a[nother] Chacham that he should be Metaher!

Answer: There is no adamancy that the asker not do so, only the [second] Chacham (may not permit what another Chacham forbade). One may ask as many [Chachamim] as he wants, for amidst this they will be meticulous about the matter. Sometimes the first erred, and the matter will be clarified. (See Tosfos Avodah Zarah 7a DH ha'Nish'al, and Chulin 44b DH Heichi.)