The rpo color code for my 2005 silverado 1/2t says the following.
25u primary color exterior, bright blue met (02)
25u primary color exterior, cadet blue met (02)
25u primary color exterior, canal blue (02) holden
25u primary color exterior, steel blue met (91)
25u primary color exterior, dark ming blue (02)
25u primary color exterior, purutamina blue (02) (holden)

however, 3 paint shops i've been to say it's indigo blue mettalic.

What gives ???????

This was the same thing on my 02 silverado