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It is said that the Kairoseki is just a solid form of the sea and have the
same effect as the sea.

But why does Kairoseki weaken and negate devil fruit's power, like when a DF
user is handcuffed or touched by it, it drains their energy and they lose
their ability (Logias can't transform when handcuffed).

In case of sea water, I think it just drains their energy but never negates
their ability (e.g. Luffy can still stretch to use elephant gun to knock out
Kraken).

And is it ever shown or explained where the Kairoseki came from?


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one-piece
Why is Kairoseki's effect more powerful than the sea?


Firstly Kairoseki is not solid form of sea  
"It was stated by Vice Admiral Smoker that Seastone "gives off a wavelength
that is the same as the sea itself" making him refer to it as a solid form of
the sea".  
Smoker was just referring kairoseki as solid form of the sea  

It is a naturally occurring substance in the sea which was modified by Vega
Punk and was used to make the handcuffs and other materials. (As per the
wiki).  

Something more from the wiki -  
Weakness of devil fruit users  

> Devil Fruit users are susceptible to all types of water, not just seawater.
> This includes the white sea surrounding Skypiea. He elaborated on this,
> saying that "moving" water, like rain or waves, does not weaken Devil Fruit
> users, while standing water does. Oda also said in SBS that it is not until
> a Devil Fruit user is knee deep in water that they become immobilized, this
> is seen with the Gorgon sisters and Luffy in Boa Hancock's bath.

Why kairoseki affects so much?  

> Kairoseki, a special substance that emits the same energies of the sea, can
> also cancel out Devil Fruit powers through physical contact with the user.
> Depending on how much physical contact the users has with the Seastone, the
> more their movement is weakened.


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To begin with. Kairoseki is a natural existent stone in the one piece world
Although it is pretty rare quiet allot has been used in the form of handcuffs.

Kairoseki has been said to have the same effect as the sea but this is a bit
dependent. Unlike the sea kairoseki is known to come in different desitys and
compositions there for the effect of the handcufs might or might not be
stronger then the say depending on the composition.

Just like the sea Kairoseki does not totaly negate a devil fruit user. It
drains their energy slowly but surely they will be unable to do anything.
There for it is possible for a devil fruit user to use his powers underwater
aslong as he has some strenght remaining in his body and willpower might also
have a bit of a effect on this. Although it still is a bit questionable there
where some other exceptions where the user was still able to use powers in
some situation.

> However, it has been shown that though a Devil Fruit user loses his powers
> when in contact with the Kairoseki, said powers can still be used on the
> Kairoseki, as shown seen when Mr. 3's candle wax key could open Kairoseki
> cuffs and cell doors, though this may be because the locks themselves are
> not made of Kairoseki or because the wax has no Devil Fruit powers inside it
> as shown when he unlocked Ace's Kairoseki handcuffs. Another example is when
> Shiki levitated battleships in Marineford, despite the hulls being lined
> with Kairoseki. Trafalgar Law was also able to switch Kairoseki chains with
> regular ones, using his abilities.

Hope this covers most of your questions. Source [Onepiece
wiki](http://onepiece.wikia.com/wiki/Kairoseki)


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Kairoseki, as stated, "gives off a wavelength that is the same as the sea
itself" (not the solid form of sea) and is used to somehow disable the devil
fruit powers of the users (only when it is in direct contact with them). As
for the story, it only stated that the devil fruit uses are completely
rejected by the sea and just drown, nothing is mentioned about cancelling out
the devil fruit powers.

Simply put, devil fruit users are afraid of the sea (immobilizes them), and
kairoseki (cancels out their powers), and they emit almost same wavelengths.

As for the origin, nothing is mentioned in the story. Same is the case is with
the Devil Fruits. They just exist in the One Piece's world like a natural
thing.

As asked in the question, the effect only seems more effective because the
user becomes incapable of using devil fruit powers, making the user completely
normal human.

This however raises another question whether the devil fruit user will drown
in sea while in contact with kairoseki, to which I would like to know myself.


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answer


> Q. It is said that the Kairoseki is just a solid form of the sea and have
> the same effect as the sea.

Kairoseki is a naturally occurring (though apparently rare) substance that can
cancel out Devil Fruit powers and weaken Devil Fruit users. It _gives off a
wavelength that is the same as the sea itself_.

* * *

> Q. But why does Kairoseki weaken and negate devil fruit's power, like when a
> DF user is handcuffed or touched by it, it drains their energy and they lose
> their ability (Logias can't transform when handcuffed).
>
> In case of sea water, I think it just drains their energy but never negates
> their ability (e.g. Luffy can still stretch to use elephant gun to knock out
> Kraken).

When comparing two different things, the comparisons should be based on the
**same terms**.

For example, you mentioned that Logia users can't transform when they are
handcuffed with Kairoseki, but then, _they can't transform when they are in
sea either_. So this example does not prove that Kairoseki is more powerful
than sea.

Next, coming to the Luffy example _(Paramecia type)_.

We know that both Kairoseki and sea weaken Luffy's strength, but we have seen
that they do not cancel off his power, i.e. Luffy doesn't have enough strength
to use his powers on his own. That is why the strength of his punch weakens
when he uses the Elephant gun on Kraken as it goes out of the bubble and makes
contact with the sea.

To make it even more clear, I'll give a better example.

When in Arlong park, as Luffy was about to drown in the water, _Nojiko_ had to
stretch Luffy's head out in the surface, to try to get him to breathe again.
From this it is clear that a DF user (Paramecia type at least) only loses his
strength and not his abilities even when under water.

The same way, when handcuffed with Kairoseki, Luffy loses all his strength and
is unable to use his abilities by himself. We have not seen any case where
someone tried to pull Luffy and was unable to because he was tied to
Kairoseki. Thus, there is still a chance that even with the Kairoseki in
direct contact with the user, their abilities can be made use of, but by
somebody else, and not by the user themselves as they are totally drained out
of energy.

**Conclusion:** This answer doesn't answer the question _Why is Kairoseki's
effect more powerful than the sea?_ directly, but rather provides some
evidence to show why Kairoseki's effect wouldn't exactly be greater than the
effect of sea on a DF user. I used two examples, that of a Logia and a
Paramecia type DF user to compare and show the same. Thus the answer would
have to be, **No** , _Kairoseki's effect is not more powerful than the sea_ as
we do not have any proper evidence to support such a claim. They both emit the
same wavelength and thus, quite fittingly, have the same effect on the DF
users.

_Update:_ To support my answer even further, I found an interesting piece of
information on the wiki page of [Yami Yami no
Mi](http://onepiece.wikia.com/wiki/Yami_Yami_no_Mi). You can see that
(emphasis mine)

> The most unique and frightening advantage of the fruit is that the user also
> has the ability to nullify the powers of other Devil Fruits by simply
> touching the user and draining them of their abilities. All types of Devil
> Fruit, be it a Paramecia, Zoan or Logia, are affected by this, though Logias
> are most affected as they can no longer become intangible by transforming
> into their respective element. **This nullification truly seems absolute, as
> though the Devil Fruit users had never gained their powers at all. This was
> shown when Luffy's stretching powers were canceled on touch, unlike the
> effect of a body of water or seastone, both of which just inhibit a person
> from controlling their powers. It was shown earlier when Luffy was stuck
> underwater that his neck could still be stretched above the water's surface,
> and that Busoushoku Haki would simply nullify the defensive aspects of a
> Devil Fruit such as intangibility and the malleability of rubber.**


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