He's been having a horrible time ever since he gained this cyan coloration, really. His best guess what it was supposed to represent focus, goals, all with a rational frame of thinking; the catch was - and he'd never admit it out loud - he didn't really have a clear goal right now. The most recent goal he'd had was the portal, but even then calling that recent was a stretch; that, and it was definitely done with. That's what he keeps having to remind himself at least, since this stupid thing kept screwing with his head, giving him brief bouts of fixating, planning best on how to get a portal built, only for him to remind himself of his failure again, kick starting all those negative emotions he was attempting to avoid, and making the entire cycle he's got going on worse.
He's finally fed up with it now, and spotting a paint can across the way, he figures this might just be the fix he needed. Prying it open with his claws reveals a deep red within. He had a good guess as to what that might be, but considering his last color related incident is what caused this whole problem, he'd rather be sure before he applies it towards himself.