Cubs/Cards and Blue-ish Hair

It is Cubs/Cards weekend up at Wrigley.  The Cubs are doing well since the All-Star break, and I am excited for the series.  Hopefully we can keep it up and I will have more to post about this series soon.  However, I want to start with one question - What did Carlos Martinez do to his hair this time?  (Although, it isn't helping his pitching, since Contreras just hit a two-run homer of of him as I am writing this.)
Go Cubs!