Adding onto what Wayne Bingham said, Koolstop black and salmon brake pad compounds (seen in their Campagnolo Nuovo Record replacement pads as well) are defined on Koolstop's website as:
Black: dry condition compound
Salmon: extreme conditions compound (wet, mud, dry)
http://www.koolstop.com/
So your type of riding may guide a choice of black or salmon....
..........
Peter Brueggeman
La Jolla California USA
4peebee(at)peterbrueggeman.com