Almost certainly Snape
The Harry Potter Wikia has an article for the student aptly named Unidentified Potions student. In it, it identifies Tom Riddle, Snape and Lily as possible candidates.
This student may have been a member of the Slug Club, as Professor Slughorn accepts talented students.
It is possible that this student may have been Tom Riddle,...
Would there have been a Dark Mark?
I'm inclined to say yes. When Barty Crouch transformed into Moody, the transformation removes the limbs and body parts that have been severed. So the potion does seems to include external modifications to someone's physical appearance, not just a clone based on their DNA or something like that.
More to the point, when Ron ...
It was simply the use of cat hair instead of human hair.
As Professor Snape says to his class, potion-making is a subtle science and exact art. Changing even a little thing can cause the effects of a potion to differ drastically from the intended or usual effect. Polyjuice Potion is already a difficult to brew potion, and presumably brewing it is as much as ...
To me this seems obvious:
The potions weren't prepared by Slughorn.
They may have been prepared by Snape the previous year. There's no reason to think Slughorn deviates much from the syllabus Snape would have followed had he continued teaching Potions, so it makes sense for Snape to have prepared these potions each year for use in teaching sixth-years the ...
The real Moody is well-known for carrying around a hip flask, and only drinking from it, as to avoid being poisoned. Presumably he will drink from it whenever he wants. Barty Crouch Jr. knew this, and used the hip flask to carry around his Polyjuice Potion, as we see at the end of The Goblet of Fire, when Dumbledore pours out the flask onto the floor. So he ...
An interesting question that can really only be answered with speculation.
I'm gonna say not much for two reasons.
First, Voldemort's soul is by now most grievously damaged. As Dumbledore explains to Harry:
'...Lord Voldemort had seemed to grow less human with the passing years, and the transformation he had undergone seemed to me to be only explicable ...
Apparently the movie and book represent alternate realities, because this never happened in the book. However, if it would have happened in the book, we can venture a guess that Snape would have been the previous student.
Later in the book (Chapter Fifteen), Slughorn discusses Harry's Potions ability with other teachers, and he mentions the amazing Draught ...
Slughorn is portrayed as a compulsive networker; someone who makes connections with his students at an early age and parlays those relationships into favourable outcomes for himself. Dumbledore describes him as someone who operates behind the scenes, influencing the rich and powerful through sheer force of persuasion.
‘Horace,’ said Dumbledore, relieving ...
There are only two accounts of Polyjuice Potion used to effect a gender change; all other transformations are man-to-man or woman-to-woman (or, in one case, woman to catwoman). In neither of the given examples is any explicit indication of anatomical correctness given, which is fitting for a series of novels aimed at the general PG crowd (maybe PG-13, ...
Polyjuice potion works for up to twelve hours at a time.
The effect of the potion is only temporary, and depending on how well it has been brewed, may last anything from between ten minutes and twelve hours.
Considering the fact that classes at Hogwarts are less than twelve hours long (I hope), he would have had no problem.
Yes, Mandrakes are sentient in their own way.
First, Mandrakes are described as "babies" in Chamber of Secrets -- Harry is surprised when Professor Sprout pulls the first Mandrake out of its pot and it looks humanesque. The Mandrake also apparently has a gender.
Harry let out a gasp of surprise that no one could hear.
Instead of roots, a small, muddy ...
I don’t have canon evidence to back this up, but I think it probably comes down to a matter of legality and ethics.
We know that you can’t use Veritaserum on students. We know that the use of Veritaserum on students is regulated (thanks ike and Mac in the comments for correcting me). In a similar way, I’d expect Legilimency to be restricted, perhaps even ...
I don't believe there is an example of a counter-spell, but at Gringott's there is the "Thief's Downfall". On page 534, of HP and Deathly Hallows, Scholastic edition:
...to Harry's horror he saw that she [Hermione] was no longer Bellatrix
As Griphook explains:
It washes away all enchantment, all magical concealment!
So while there isn't an example ...
We know that Love Potions are legal, simply because the twins sell them. Their public store is visited by 100's if not thousands of people a day, leading us to assume that if they were illegal,
A. they wouldn't be on the front shelves.
B. someone would have reported them by now.
Other notable instances are in book 2, Lockhart suggests that Snape brew up ...
Stopper death: since the pattern of the expression is "to <verb> <noun>", it means that "stopper" is a verb.
Dictionary.com has only one verb usage:
verb (used with object) 6. to close, secure, or fit with a stopper.
This very clearly means that he was referring to collect - and close - a bottle of deadly poison, NOT potion that will stop death.
On the face of it, this does seem a bit of a goof. Slughorn is laying low at the Muggle house, then turns up at Hogwarts and within "a few weeks" has access to Felix Felicis.
Off the top of my head, this could be accounted in one of two ways:
There's no special reason to assume that it needs to be made in a single sitting. It's certainly possible that some ...
Although it's not clear what rules Hermione was referring to, we can see what rules they actually broke:
Entering the restricted section of the Library and, presumably making a potion that the Potions-Master considers too advanced
Snape said it was in a book called Moste Potente Potions and it’s
bound to be in the Restricted Section of the library.’
Then I packed up Moody’s clothes and Dark detectors, put them in the trunk with Moody, and set off for Hog- warts. I kept him alive, under the Imperius Curse. I wanted to be able to question him. To find out about his past, learn his habits, so that I could fool even Dumbledore. I also needed his hair to make the Polyjuice Potion.
He states ...
Lacking color and odor is distinctive, and she had information to deduce it.
First of all, being colorless and odorless does help identify the potion - it eliminates all potions that have either a color or scent. In addition, she knew from what Slughorn said that it would be a N.E.W.T. level potion.
“Now then,’ said Slughorn, returning to the front of ...
Well, I think the confusion comes with mixing movie canon with book canon. In Philosopher's Stone, here's what Harry sees when Quirrell unwraps his turban:
Harry would have screamed, but he couldn’t make a sound. Where there should have been a back to Quirrell’s head, there was a face, the most terrible face Harry had ever seen. It was chalk white with ...
The accents stay for people who had them before drinking. So I assume they won't appear for people who didn't have them.
“Bah,” said Fleur, checking herself in the microwave door, “Bill, don’t look at me – I’m ‘ideous.”
- Fleur, Polyjuiced into Harry, displaying her Veelarench accent
DH, Chapter 4, "The Seven Potters"
We know that silent "H"s are ...
We don't know.
There doesn't seem to be any other canonical indication of a special connection between Hermione and grass; it's not something explored elsewhere in the books or expanded on by JKR in interviews.
I did find this fanfic which gives some plausible (but of course not canonical) explanations of why grass means so much to her: the grass of ...
I agree that this is an interesting question. I also agree that it is part speculation, but we can draw some conclusions from evidence in the books/movies. I'm going to try and break it down as best I can.
The first thing that needs to be considered is whether or not it would have any affect on him at all purely from the standpoint of whether or not it is ...
To clarify, I think what Ron meant when he said "I knew Ginny was lying about that tattoo" is that Ginny had been playing a joke on Ron by telling him Harry had a tattoo, when Harry actually didn't, and never had had a tattoo. I do not think it suggests that tattoos wouldn't be replicated through Polyjuice Potion.
I think canon is clear that Polyjuice ...
Lets take the account of Moody and Barty Crouch Jr and use it as an example/reference.
Barty is using polyjuice potion all year long, with no apparent change in weight or hair.
fast asleep, thin and starved in appearance, was the real Mad-
Eye Moody. His wooden leg was gone, the socket which should
have held the magical eye ...
I think the question you are trying to ask is really if they are Sapient...
Many animals and plants are sentient but not sapient.
Sentience is the ability to feel, perceive, or to experience
Sapience is often defined as wisdom, or the ability of an ...
I do not believe there's any reference showing that it is in real time. You only essentially take the shape of another person, it's not meant for you to be an exact clone where whatever happens to them happens to you.
Polyjuice Potion is a very complicated potion that allows the drinker
to assume the ...
In HBP Slughorn implies that love potions have a shelf life:
"Was this potion within date?" asked Slughorn, now eyeing Ron with professional interest. "They can strengthen, you know, the longer they're kept."
While not a specific answer it does indicate that some potions can go bad.
Big huge thanks to Stackstuck's comment about the story.
I remember something like this. It was pills, not potions. Unfortunately, I don't have a link to it and I'm not 100% sure of the author. So I can't really help. I want to say Yudkowsky. But I doubt it.
He was right, it was pills and not potions and I found the post quickly after he mentioned it. It'...
Polyjuice Potion seems to last at least 8-12 hours (I think this is obvious, but I'm just going by canon). In Chamber of Secrets in chapter 12, The Polyjuice Potion, Hermione is up "very early" on Christmas morning, adding lacewing flies to the Polyjuice. She suggests that the trio take the Polyjuice that night, which, depending how early she was up in the ...