91 votes
Accepted

Why does everyone in Harry Potter make a giant cauldron of potion?

It's quite possible that some recipes don't divide well. Have you ever tried to halve a recipe that calls for 1 egg? It can be done, but it's a bit annoying and cannot be done without physically ...
Nuclear Hoagie's user avatar
88 votes
Accepted

Who was the student that previously brewed a potion of sufficient quality to claim the Felix Felicis?

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 ...
TheLethalCarrot's user avatar
  • 143k
50 votes
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What was wrong with Hermione's Polyjuice potion in CoS?

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 ...
Obsidia's user avatar
  • 106k
45 votes
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If Wolfsbane is to be taken a week in advance, why does it matter that Lupin hadn't taken it on the night of the full moon?

The first quote you cite is a bit vague. At face value it could seem to mean that the potion need only been taken once during the week in order for it to be effective. However, it could be that the ...
Alex's user avatar
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40 votes
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How did the Polyjuice potion's effects last through lessons, which are more than an hour?

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 ...
Mithical's user avatar
  • 38.9k
39 votes

Who was the student that previously brewed a potion of sufficient quality to claim the Felix Felicis?

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 ...
Alex's user avatar
  • 44.7k
28 votes

How did the Polyjuice potion's effects last through lessons, which are more than an hour?

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 ...
ibid's user avatar
  • 93.8k
22 votes

Why does everyone in Harry Potter make a giant cauldron of potion?

As alluded to in comments, I suspect that the reduced error from scale may also play into it. Some of the ingredients added to the potions are fairly small amounts, and we see in the books that small ...
FuzzyBoots's user avatar
  • 225k
18 votes
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In Harry Potter and the Half Blood Prince, how does Hermione recognise Veritaserum?

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 ...
Obsidia's user avatar
  • 106k
14 votes
Accepted

Why did Hermione smell grass in the Amortentia?

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 ...
Rand al'Thor's user avatar
  • 134k
13 votes

Did Snape teach any of the potions techniques that he invented to any of his students?

Not that We Know of There doesn't seem to be anything indicating Snape taught the techniques from his copy of Advanced Potion Making. However I would disagree that we have proof Snape invented/...
Dario Quint's user avatar
12 votes

How do injuries work with Polyjuice Potion?

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. below, apparently ...
Himarm's user avatar
  • 66.2k
11 votes

What was wrong with Hermione's Polyjuice potion in CoS?

The use of cat hairs meant that she didn't transform back after one hour. Others have made this point but I thought I'd add an answer with the relevant quotations from the books. There was nothing ...
The Dark Lord's user avatar
11 votes
Accepted

Online post/short story, about potions that give you different powers

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 ...
RealGigex's user avatar
  • 301
10 votes

How did Voldemort intend to question the person who got to the locket?

Maybe he didn't... ...at least, not if they actually got the locket. It seems clear to me that the potion is meant to kill the person who took it, if they drink all of it. When Regulus Black drank all ...
Adamant's user avatar
  • 116k
10 votes

Why didn't Dumbledore, or Harry, just summon animals to drink the Emerald Potion?

There are a few problems with doing that. First and foremost, I think that both Harry and Dumbledore would've seen that as cruel and cowardly. It's also unclear what limits there are on summoning ...
EJoshuaS - Stand with Ukraine's user avatar
10 votes
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Would someone be able to use Felix Felicis to make MORE Felix Felicis?

The books don't mention specific categories of limitations for Felix Felicis. In this answer I discussed at length what Felix Felicis actually can and can't do. In short, it seems to primarily give ...
Alex's user avatar
  • 44.7k
10 votes

Why does everyone in Harry Potter make a giant cauldron of potion?

In some few cases the potion will be the result of reducing through boiling for a long time. This is somewhat like maple syrup. You boil it for a long time to concentrate the non-water ingredients, as ...
Boba Fit's user avatar
  • 585
10 votes

Why does everyone in Harry Potter make a giant cauldron of potion?

Magic in Harry Potter is quite often rather symbolic in how it works. I think that, when it comes to potions, this means that the size of the batch matters; like, if you're adding 7 pinches of dried ...
Anju Maaka's user avatar
9 votes
Accepted

A short story involving time travel induced by a potion/tablet/medicine

There have been quite a few stories on that theme, but given the early twentieth century English setting, you may be thinking of "The New Accelerator", a 1901 short story by H. G. Wells, ...
user14111's user avatar
  • 163k
8 votes
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How is it possible to turn a human into an Ood?

As is perhaps usual in Doctor Who, we are not given much of an explanation as to how the transformation works. Ood Sigma simply refers to the concoction as : SIGMA: Ood-graft suspended in a ...
Adamant's user avatar
  • 116k
8 votes

Where did Hogwarts store all the cauldrons?

This may answer some parts of your question. All cauldrons are enchanted to make them lighter to carry, as they are most commonly made of pewter or iron. Modern inventions include the self-...
Shobhit Garg's user avatar
8 votes

Did Snape teach any of the potions techniques that he invented to any of his students?

I can't give completely canon evidence, but I think it's very possible he might do. In earlier books he writes down instructions on the board for them to work from. Once Snape had turned his back on ...
BeginTheBeguine's user avatar
7 votes
Accepted

Are Love Potions actually banned at Hogwarts?

Most likely that snippet is fact. The whole article that quote is from is a slam piece aimed at Hermione. ‘She’s really ugly,’ says Pansy Parkinson, a pretty and vivacious fourth-year student, ‘but ...
Himarm's user avatar
  • 66.2k
7 votes
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Can the Felix Felicis substitute as a rape drug?

No. Felis Felicitus makes you lucky. The Harry Potter novels don't fully explore what that means, but Larry Niven's Ringworld did, in the person of Teela Brown. (Granted this was kind of retconned ...
Harry Johnston's user avatar
6 votes

What was wrong with Hermione's Polyjuice potion in CoS?

The potion is complicated and can go awry. For example, when Hermione brewed Polyjuice in her second year, she intended to take the form of Millicent Bulstrode, but she mistook a cat's hair for ...
Scath's user avatar
  • 524
6 votes

Can the Felix Felicis substitute as a rape drug?

Logically - No. You cannot push luck to force something out of someone. Using luck, Harry convinced Slughorn to disclose his memory using logic and shame, there was no forcing involved. Slughorn felt ...
TimSparrow's user avatar
  • 12.9k
6 votes
Accepted

Where did Hogwarts store all the cauldrons?

Possibly their cauldrons were stored in the Potions classroom. It seems like, at least some of the time, students leave their cauldron in the Potions classroom. They take them back after each school ...
Obsidia's user avatar
  • 106k
6 votes

Do eclipses have an effect on the efficacy of potions?

There doesn’t seem to be any magic said to be affected by eclipses. There’s absolutely no mention of what effect an eclipse would have on any type of magic in the books. The word “eclipse” only is ...
Obsidia's user avatar
  • 106k
6 votes

If Wolfsbane is to be taken a week in advance, why does it matter that Lupin hadn't taken it on the night of the full moon?

The week includes the first full moon day. To transform safely, Lupin has to take the Wolfsbane Potion every day in the week preceding the full moon. Presumably if he misses a day of taking the ...
Obsidia's user avatar
  • 106k

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