User blog comment:MegaWho99/Zoom Lighting Colour/@comment-26624146-20160917091054

I assumed Zoom was switching between blue and yellow lightning, or injecting himself with Caitlin's version of the Velocity drug was simply changing his lightnign back to yellow for a time. In "Escape from Earth-2" after "Jay" takes V-9 and saves the people in the hosptial, Zoom then shows up on Earth-2 to beat the crap out of Barry. I assumed this meant Hunter was on Earth-1 then travelled to Earth-2 to take his anger out on Barry because he worsened his own condition, then made a time remnant to take his place on Earth-1. If that is the case then Zoom must be capable of changing his lightning. If you notice when he injects himself with Barry's Speed Force blue and yellow lightning can be seen emitting around him.