if u didn't knew Shanks Swords color is changing too multiple times, from half white half gray during WB vs Shanks clash, into Black and White at Marineford and then turn into full white now. So there is nothing new that Greenbull sword turn into full white. if u wondering :
WB vs Shanks Clash :
Marineford :
Then now its full white
WB vs Shanks Clash :
Marineford :
Then now its full white
On the opposite, to my knowledge you cannot find a single instance of a completely black blade (drawn even with the white hamon in the center, typical of black blades and haki-infused swords) that in reality was white, like he anime showed. For an obvious reason: because if it was, it would have been white in the first place.
It was the first time in the manga? Maybe, but we are talking about that then: a thing that has never happened in 1100 chapters.
