White Composite Bow

This was brought up in the forum, but anyone heard if White Composite Bows can drop from hitting an Emain Macha lamp post?

The edit to the specially-colored composite bow page appear to be reliable, but, well...I suppose I still have my doubts.

While we're at it...someone explain the Black LLB on the LLB image page...the Icon is there from a screenshot I took with someone having it on...