IMHO, there is no blue involved.
The bulbs have an iridescant purple coating to them and the light output is nice and white with a hint of purple (That is reminescant of the BMW 745I HIDs

)
Last night was my first time driving with them and all I cna say again is WOW! I never felt comfortable turning off my PIAAs with my APCs, with the Silverstars I felt comfortable doing this.
Even though Roger and I don't agree on Waxes/Polishes

, I will honestly say I agree with him on the Silverstars (especially with 9005s in the low beam) mod! Worth the $42. I think I could put these pretty high on my favorite mod list, definately behind the PIAAs and my Donnelley mirror though!