Verin: Black, Brown, or Purple?

Is Verin Black Ajah?

Did Verin lie in The Great Hunt?

(Survey Says)

Verin tells the boys that Moiraine sent her to look after them (TGH: 14, 231, Wolfbrother, 195):
"Moiraine Sedai sent me, Lord Ingtar," Verin announced with a satisfied smile. "She thought you might need me." Moiraine later says that she did NOT send Verin (TGH: 49, 675, What was Meant To Be, 572) "I did not send Verin." Moiraine frowned. "She did that on her own. It is pretty obvious that Moiraine is not BA, so that implies that Verin lied, and hence must be BA.
DEFENSE: Verin could have been tricked by somebody masquerading as Moiraine, maybe Lanfear. Or, perhaps she managed to find an interpretation of her words that could be taken as the truth. (Moiraine wanted somebody to watch over you guys, but she couldn't be here...) Now, MAYBE Verin is using some sneaky thought process to get around the Oath: '"Moiraine Sedai sent me Lord Ingtar," Verin announced with a satisfied smile [recalling how satisfying the Beer and Pizza Moiraine had sent her for had been, and also how satisfying it had been to come up with a literally true statement which would preclude any questions from Rand, et. al.] (Edward Measure)

At a signing in Atlanta, RJ said that this discrepancy is not a mis-step.

Why didn't Verin give Egwene Corianin's notes?

Verin does not give Corianin's notes to Egwene along with the dream ring. Relevant passages: TDR: 21, 241-2, A World of Dreams, 187. Maybe she wanted Egwene to get killed, or caught by some Forsaken?
DEFENSE: Four reasons that Verin wouldn't want to show the manuscript to Egwene:

Verin is afraid that Egwene would not continue if she knew how dangerous it is.
Verin is afraid that Egwene would not continue if she knew who or what must be sacrificed.
The very nature of prophecy requires that it be vague or kept secret.
Maybe Verin was afraid that Egwene was a Darkfriend. Also, note that she considered giving the notes to Egwene, but decided not to. If she was withholding the notes for a nefarious purpose, she wouldn't have even considered it.

Her suspicious behavior in the 2 Rivers

Misleads Perrin as to why she and Alanna are there TSR: 31, 493-4, Assurances, 345-6.
Tells Perrin not to trust Alanna, perhaps laying a false trail? TSR: 33, 533, A New Weave in the Pattern, 373.
She also knows Luc is the missing Lord Luc, Tigraine's brother who disappeared in the Blight. She knows he is mentioned in the Dark Prophecy, yet she does not warn anyone about him? Or tell them who he is?

1 and 2 are typical Aes Sedai behavior. As for 3...

Perrin's choice

Only three characters have referred to Perrin's choice of hammer or axe: Ishamael, Lanfear and Verin. This puts Verin in very suspicious company.
DEFENSE: Verin is Brown Ajah, and thus is likely to know all sorts of obscure things. (Also note that the above statement is somewhat false: Egwene also knows about the hammer/axe choice. She dreamed it.)

Barthanes

Was observed in deep conversation with Barthanes, a known Darkfriend, at the party in TGH: 33, 470, A Message From the Dark, 397 When Hurin approached them, Verin waved him away. Perhaps they were discussing "business matters?"
DEFENSE: No, they were just talking about the weather/politics/etc and Verin didn't want some Shienaran servant butting into her conversation; it wouldn't look right and might make Barth. suspicious.

Moiraine and Siuan

In TFoH: 53, 900, Fading Words, 638 Moiraine mentions to Rand in her last letter not to trust Alviarin, who is definitely a Darkfriend, and Verin. Additionally, Siuan mentions that Verin never told her about giving Egwene a ter'angreal.
DEFENSE: The former is just an exercise in contrasts. Moiraine is saying: "Don't trust ANYBODY. You are rightly suspicious of Alviarin, but you should be equally suspicious of those you think you can trust, like Verin." As for the latter, why should she tell SS?

Draghkar Attack on Moiraine

TGH: 22, 331-3, Watchers, 278-9 Executed at least with Aes Sedai help (the warding on them so they couldn't be sensed). Moiraine seemed to think that pretty much everyone in the Tower had forgotten about these old hermit Aes Sedai. However, we do know one individual old enough to remember them who could have ordered the attack -- Verin.
DEFENSE: This is totally wimpy speculation, and wouldn't even be here, except that somebody might bring it up again. Liandrin (known BA) could have easily followed Moiraine there.

Is Verin basically good, or basically evil?

Alternative Verin Speculations

Something in those Notes Theory: We know Verin had access to Corianin Nedeal's notes. There is something in those notes that Verin doesn't want anybody to know about, something so potentially dangerous that she'd consider destroying the notes and all the knowledge contained therein. What if, in those notes, Corianin Nedeal describes how she discovered how to break the Three Oaths in T'A'R? That would certainly explain why she wouldn't want Eg to have the notes, especially after her speech at the start of TDR about how important the Oaths are. This would also explain how she managed to lie about Moiraine sending her. Plus, who knows what eldrich knowledge is contained in the notes? Who knows what Verin saw when she tried out the ter'angreal to go to T'A'R? This could explain all sorts of Verinisms. (Keith Casner, Pam Korda)
Verin == Corianin Theory: Verin is Corianin Nedeal herself, and is thus very, very, old. That is how she got her hands on the ring ter'angreal. Problem: In TDR: 21, ?, A World of Dreams, 19, Verin is thinking on Nedeal's notes, and thinks of Nedeal in the third person. One doesn't usually refer to oneself in the third person. Another problem (which is also present in related Very Old Verin (VOV) theories is that if there was a 400+ year-old Aes Sedai lurking around the Tower, surely somebody would have noticed by now. (Dave Delany, etc)
Second Foundation Ajah Theory: Verin is a member of a secret society whose members preserve ancient knowledge for humanity's need at the Last Battle. The existence of the BA shows that it is possible for a secret group to exist in the Tower--if there is a group dedicated to evil, why not a group dedicated to good? Problem: there have always been rumors of the BA. Nothing can be kept secret for centuries in a place with so many people in it, and so much scheming as the White Tower. And yet, we've never heard any hint of this secret group. (Mark Hazen, etc)
Very Old Verin: Verin is very, very old, and pre-dates the lying Oath, and is thus not bound to it. This theory has been proposed as part of various Second Foundation Ajah theories, Corianin Nedeal theories, as well as independently. problem: Verin would have to be 1000+ years old. We have seen no evidence, even in the AoL that anybody lives that long, without help from the DO. Plus, wouldn't anybody notice that Verin had outlived dozens of Amyrlin Seats?

How old is Verin?

Many pet theories hinge upon this question. From LoC: 11, Lessons and Teachers, 207, we know that Verin has been working on some plan for about 70 years. This sets a lower bound on Verin's age. The only other possible clue is LOC: 43, The Crown of Roses, 549. Merana Sedai is considering the pecking order among the AS in Caemlyn: "Merana had been Aes Sedai ten years the day the midwife laid Alanna at her mother's breast...Verin was the problem...Five years as novice for each, six as Accepted; that was one thing every Aes Sedai knew about every other if she knew nothing else. The difference was that Verin was older, maybe almost as much older than she as she was older than Alanna." We know that the Tower doesn't take women much older than Ny for Novices, and an average novice starts at about the age Elayne and Egwene did (17-18), for the Very Old Verin folks, lets say both Merana and Verin started late -- 24 (Ny was an exception, I think they only took her because she was so strong). So if Alanna is about 35 (a reasonable guess), Merana is 24 + 11 years training + 10 years as full AS = 45 years older than Alanna, that is, 80 years old. If Verin is as much older than Merana as Merana is older than Alanna, then Verin is 80 + 45 = 125 years old. So if Merana is right about how much older Verin is than she, Verin cannot be much older than 125 years.