On this page the 6th picture down shows some of the blue vw bolts:
http://www.passatworld.com/forums/sh...d.php?t=104287
I did notice on some of my fasteners that the blue was splotchy as in there were areas with noticeably darker blue. This may help identify the coating.
I also have some yellow chromate. Are the yellow and blue chromate equal in corrosion resistance? Are there differences only cosmetic?