What would happen if bạn used the hair of a person using polyjuice in your polyjuice?

..you'll be just like him/her..
in physical looks..!!

An interesting question, one I do not know the answer to...
But I'll have a go...

Let's say A is a person, and they have just taken polyjuice potion to turn into B. Now I come along and take some of ABs hair...

I think I would turn into A, Not B, because although the hair may LOOK like Bs, it's still really As hair, just looks different.

I hope that makes sense...

If I ever could get a piece of her hair, I would be Holiday Reinhorn. Oh to be her. *dreams*

Good question. It depends did bạn take it from them while they where polyjuiced hoặc not. If bạn took it while they where normal you'd be them if bạn took the hair frome them while theyre useing the potion youll be the one they turned into if that makes sence.

hoặc at least I think.

Heres another question, what happens if bạn use your own hair in a polyjuice potion? Does it have no effect hoặc have some weird side effect?

That is an exelent question.
My answer may be wrong as I am only guessing, however, I'll give it a go.
Lets use examples: if Harry wanted to use polyjuice potion to turn into Ron, and Hermione was using polyjuice potion to turn onto Ron, Harry would take the hair off Ron head and I'm just guessing here, but I think he would turn into Ron because the hairs are technically Rons.

I'm not sure, but let's say Dumbledore took a hair from Snape, who was actually just Flitwick after using polyjuice potion, Dumbledore would still turn into Flitwick. The outside of a person might change, but the brain stays the same, so person's original DNA also doesn't change. ^.^

Since it requires a DNA sample, it can be assumed that the Polyjuice Potion works bởi replacing the drinkers DNA with that of the sample. It can then be assumed that that persons hair would be the hair of the sample and not his/her own.

i think that if harry for example whated to change into someone that could help him though something to defeat voldemort hoặc something that he would get that porsons hair and but it in the potion and then he would have a sick feeling then change into that porson it will still be him but his looks are different and they can wear off so he would not stay that porson for a long time