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If Snape was removing his memories of Lily and placing them in the pensieve every time he and Harry practiced Occlumency to keep Harry from seeing them, does that mean that Snape, in essence, could no longer remember them? Does that also mean that if you removed a memory to the pensieve to keep someone from seeing it, would this be a way to avoid the truth telling effects of Veritiserum?

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    Everything I can recall from the books suggests you do keep memories placed in the Pensieve, which does leave us to wonder why Snape putting his memories in the Pensieve would have prevented Harry from seeing them. – Torisuda Mar 26 '16 at 20:57
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    As they were unflattering memories of James Potter, and Harry was known to be curious in the extreme, I've always assumed the memories were a trap. Additionally, this sort of pettiness is consistent with Snape's character. – Morgen Mar 26 '16 at 23:05
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    A lot of overlap with this question, you might want to look at the answers: How does removing a memory work in Harry Potter? – sumelic Mar 27 '16 at 1:35
  • Seems odd that you would forget them. How would you know what is in your basin when you need to remember something? Also, when you go in to experience your memory, you would either trigger your memory of it or be experiencing it all over (and creating a second memory of it in the process). – David Starkey Mar 28 '16 at 13:03
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Based on a convincing argument I've decided to amend my answer to say that it must depend on the situation.

Dumbledore showed Harry several of his own memories in the series (meeting Voldemort, trials of Death Eaters after the first war) at times he even accompanied him into them.

Memories like these were stored in his office and not his head, so they must be copies. If he couldn't remember them himself when they were in the bottles/phials in his office or in the Pensieve itself, the situation would have been very different.

Since Snape seems to use the Pensieve for protecting his memories, perhaps there is a way of either copying or storing the original depending on your need. Though, thinking about it, if Snape forgot what he put in there, how would he know to go back for them? Perhaps they are protected in a different fashion in the Pensieve.

Pottermore has JKR's writing on the Pensieve which explains:

"The Pensieve is enchanted to recreate memories so that they become re-liveable, taking every detail stored in the subconscious and recreating it faithfully, so that either the owner, or (and herein lies the danger) a second party, is able to enter the memories and move around within them."

And later:

"Even more difficult than the recreation of memories is the use of a Pensieve to examine and sort thoughts and ideas, and very few wizards have the ability to do so."

There is no mention of hiding memories in the way that Snape does. It clearly is primarily an aid to thinking and studying memories, not something designed to make you forget.

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    I don't see the problem. First, Dumbledore stores a memory in the Pensieve, so he forgets about it. But he still remembers he has just stored an important memory in the Pensieve. Then he can use the Pensieve to see the memory. And after that he will remember the memory he has seen using the Pensieve. – Oriol Mar 26 '16 at 21:42
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    "if Snape forgot what he put in there, how would he know to go back for them" The same way you remember that you need to grab your grocery list before you go out the door, without having to remember what's on the list. – Josh Caswell Mar 26 '16 at 23:45
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    @Josh Caswell - That's funny :-P But Snape apparently took out a memory, forgot what it was, hid it somewhere on a shelf out of sight, remembered hiding something but didn't know what, remembered to take it down and put it back and then went, "Ah, that's what it was! Glad I didn't let him see this one!" ? You can almost imagine him getting upset each time he put it back. – ThruGog Mar 27 '16 at 1:06
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    So what you're saying is that you can either ctrl-X or ctrl-C before ctrl-V'ing your memories in the pensieve? :P – MPF Mar 27 '16 at 5:43
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    The fact that Slughorn gave Dumbledore a modified version of the memory (in the film at least) and still possessed the original is probably a fairly noteworthy example. – Obsidian Phoenix Mar 28 '16 at 9:22
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It seems you don't remember memories in the Pensieve. As you say, Snape used this as a protection against Harry during Occlumency practices in Harry Potter and the Order of the Phoenix:

The light was coming from the Pensieve sitting on Snape’s desk. The silver-white contents were ebbing and swirling within. Snape’s thoughts … things he did not want Harry to see if he broke through Snape’s defenses accidentally. … Harry gazed at the Pensieve, curiosity welling inside him. … What was it that Snape was so keen to hide from Harry?
— Chapter 28, Snape’s Worst Memory

If he did remember the memories, there would be no need to restore them after each practice:

As he opened it he glanced back at Snape, who had his back to Harry and was scooping his own thoughts out of the Pensieve with the tip of his wand and replacing them carefully inside his own head.
— Chapter 24, Occlumency

And he wouldn't be that worried about them:

Panting slightly, Snape straightened the Pensieve in which he had again stored some of his thoughts before starting the lesson, almost as though checking that they were still there.
— Chapter 26, Seen and Unforeseen

And in Harry Potter and the Goblet of Fire, Dumbledore says he uses the Pensieve when he has too many thoughts:

“This? It is called a Pensieve,” said Dumbledore. “I sometimes find, and I am sure you know the feeling, that I simply have too many thoughts and memories crammed into my mind.” “Er,” said Harry, who couldn’t truthfully say that he had ever felt anything of the sort. “At these times,” said Dumbledore, indicating the stone basin, “I use the Pensieve. One simply siphons the excess thoughts from one’s mind, pours them into the basin, and examines them at one’s leisure.”
— Chapter 30, The Pensieve

If the Pensieve didn't remove the memories from your head, it wouldn't help in this situation.

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    Not sure how it relates to the book, but doesn't Dumbledore possess a version of Slughorns memory that is different from truth, and Slughorn still possesses the original. Doesn't this indicate its not always a removal? – Obsidian Phoenix Mar 28 '16 at 9:18
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    It does indicate that, yes. And I don't think for one second that Slughorn gives Harry his original, genuine memory and then immediately forgets it. Added to the fact that Pottermore makes no mention of the hiding of memories, I personally think that too much is being made of that scene. – ThruGog Mar 28 '16 at 14:25
  • @ObsidianPhoenix It might be that Slughorn uses his imagination to create a new, fake memory based on the real one, and then he forgets about the fake one, but still has the original. – Oriol Mar 28 '16 at 17:28
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Perhaps you lose the original memory, but when you view it through the pensieve, you have the memory of viewing it through a pensieve. And the point is that that memory is actually more detailed than your orginal memory.

Further, while memories tend to distort over time, once you put a memory in the pensieve, it won't change.

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