User blog comment:BartAllen2ndKidFlash/my theory on dr.alecmey/@comment-3423279-20161012034746

As for the theory, that would be a bit weird and kinda overused with the whole Zoom thing that went on, but meh, it also might be that Julian just is Alchemy in the first place.

I actually have two theories, Alchemy is in league with Savitar is one of them, and the other is that Alchemy might be Savitar in disguise, his "carvings" are him moving so fast or vibrating in such a way that it appears to be carved by nothing or a long ranged power.

As for those skins, that's some sort of serum or whatever that unlocks the power one holds within themselves.