Are the bottom of Blu-Ray discs blue?

Question

Are the bottom of Blu-Ray discs blue?

Answer 1

of course thats why they are called blue-ray... they use blue laser which has a lower width which means more information than the usual red laser.

Answer 2

I am looking at one right now and it is a blue purple color.  Considering the name name comes from the blue-violet laser it uses instead of the older red laser, which is in HD DVD and standard DVD, the disk color makes sense.