Blue shimmering head?

[Kwyk]

Hi.

I just noticed something on my pastel BP the first time ever,if i hold him normal he looks fine but if i put his head under light in a special angle his head shimmers metallic blue?(not the complete head just the sides and only a little bit).
Is this something to be concerned about or just normal?

 

[WftRight]

That's normal, but you won't always see it. My girl is showing a little bit of iridescence after shedding today. You can see it on her body beside her head.