Agreed with others, those are chrome plated, not ceramic coated.  That is not ceramic coating on those headers. It is the chrome/nickel plating. It isn't the polished ceramic coating either...that does not turn blue. I have a set of polished ceramic coated TTI headers and they end up looking like normal ceramic coating after a while. Definitely nothing like the chrome/nickel plated headers...which is what the OP has. I've never been a fan of header wrap either. In my experience, that stuff dramatically accelerates rust issues on headers.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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