Speculations Sanji's flames are blue because it fits his color theme.

[gamaran]

Zoro is already Mihawk level

 

[Ballel]

Really? Source

No.
SBS and databooks list Sanji's color as BLUE

 

[Chrono]

Oda initially used a yellow color , people are thinking too much bout the blue colors lmao.

And yes there's no reason for COA/COC users to have different colors when using the same powers so yeah saying it's an aesthetic it's completely valid.

How does Oda using yellow intially change anything ?

 

[EmperorKinyagi]

No way???!! The most r*tarded influencers in the community think that first commanders can beat admirals?!!!

 

[Peroroncino]

No way???!! The most r*tarded influencers in the community think that first commanders can beat admirals?!!!

just wait for his blue flames>Magma video

 

[Finalbeta]

The All blue paradigm might have been it I think. But blue flames are also hotter than other tonalities.

 

[Sir Tuna Sandwich II]

It's yellow tho

lolis you bum it's blue because Sanji has blue balls!
Just like Zoro has green hair and Luffy always think on red meat!
Stop spreading disinformation like a shill! 🧐

 

[duckman]

Oda initially used a yellow color .

so, Oda didn't use a yellow color then? Glad we cleared that up;

 

[Shiroyru]

Sanji's official color = blue = blue flame

Zoro's official color = green = green CoC sparkles

Luffy's official color = red = red CoC sparkles

That's literally it. Stop bringing in heat powerscaling, it's retarded and Oda doesn't care about that.

Lol Admiral boys already coping in advance for when their golden boy Akainu gets stalemated by Sabo’s blue flames

 

[ShadyOjiro]

so, Oda didn't use a yellow color then? Glad we cleared that up;

Na it just means the blue color was not assured.

 

[Finalbeta]

Lol Admiral boys already coping in advance for when their golden boy Akainu gets stalemated by Sabo’s blue flames

Do you even realize that fire cannot affect magma in the OP verse? 🤔

 

[duckman]

Na it just means the blue color was not assured.

But the blue color was chosen, was it not? And the yellow one was not chosen. Everything else is just waffle.

 

[Colt Buntline]

No, that's a very poor excuse to downplay Sanji.

The pure blue and white colour (without some yellow flames mixed, like Marco's fire) with plasma was chosen to make it clear that Sanji has the hottest fire in One Piece.

 

[Roronoa-sama]

The first intelligent thread unlike @Sanji D Goat @Swallalala @Big D. Kaios

 

[ZhaoYun]

Zoro is already his EOS opponent's level. Both Zoro and Mihawk have green theme in their attacks.

Sadly Zoro won't get stronger after this arc otherwise Zoro will low diff Mihawk by the time they fight

 

[Finalbeta]

The first intelligent thread unlike @Sanji D Goat @Swallalala @Big D. Kaios

In general Extravlad makes pretty thoughtful threads although this one was not hard to guess cause there's way no substantial reason to think Sanji would unleash lightning from his legs.

 

[RoronoaZorro]

OP actually made some sense indeed.

Zoro's is green because of underworld connection.
Sanji's is blue because it's the next level of his fire.

Above yellow fire (common Sanji's flame), is green flame.

1. However author can't show it because it clashes with Zoro's color scheme. The next level fire color after green would be blue.

2. Green flame does not relate to temperature too. This is why Sanji's fire skips green flame and straight to blue flame. https://www.reference.com/science/color-hottest-flame-ea25c95668a5b0d1

3. It is scientifically made sense because blue flame is the hotter color RIGHT after yellow flame. If Oda suddenly uses white flame or violet flame, then his fire would be unnatural.

4. It shows that Sanji's flame can be upgraded again.

 

[ZenZu]

Sanji's official color = blue = blue flame

Zoro's official color = green = green CoC sparkles

Luffy's official color = red = red CoC sparkles

That's literally it. Stop bringing in heat powerscaling, it's retarded and Oda doesn't care about that.

That's true to an extent but obviously heat matters, that's the entire point of the IJ upgrade, the fact that he can go much much hotter than before. Having blue flames just further cements the fact that his heat got a massive upgrade.

It just gives us something to work with visually (atleast in the anime). Since naturally blue flames > reg flames.