Board Thread:Questions and Answers/@comment-81.151.75.176-20130224144137/@comment-26871105-20160513225944

Thefirestorm83 wrote: &quot;I Want a Stand&quot; by me wrote: Crazy Diamon can not "fix" and revert changes that are along the lines of absorptions/fusion and mutations caused by those or maybe other reasons, because they are not considered "damanged". The best Josuke can do in terms of reversing something would be putting shattered/injured thing/person(if they haven't died) back together and un-doing chemical effects. Yeah, this. For example if Crazy D could undo chemical reactions when it reverts shattered glass the glass should turn into sand. I believe this is also the reason he can't fix Okuyasu's dad. He theoretically couldn't unboil an egg and I see that as no different.

Crazy Diamond can actually unboil an egg, similar to how it "fixed" a plate of spaghetti back to its uncooked state at one point in Part 4.

It's however, unable to do much to "fusion" cases, or pretty much anything that involves objects or people receiving alterations in realistically impossible fashions (not including wounds received from Stands' physical oriented attacks, since though the source is supernatural the wounds are of natural nature. But injuries caused from Stands' odd powers like The Hand's elimination and others like that is another matter). Crazy Diamond can undo chemical fusions, but not fusions caused by supernatural powers or other unexplained sources where 2 completely different entities are forced into 1, such as the fusion between a guy and a rock.

This is also why Crazy Diamond will not be able to return Angelo and that guy who got merged into a book back to normal even if Josuke desires to, just like how it can't cure Okuyasu's dad who is a mutated fusion between him and the flesh bud placed inside of him.

And subsequently, Crazy Diamond can't revert arrow effects, be it the creation of new Stands, or the development of Reqium Stands.