FWIW.......

The black props and the blue props are of a differant mold, just look at the back of the hub section if you doubt me.

Secondly since SSC is rpm based you will find out the black ones are higher rpms.. IMHO its possible that the black resin may be prone to depitch more under load, than the blue resin. Black plastic color concentrate is known to be the garbage color concentrate in the plastics industry since all types of plastic scrap can be reground and be an acceptable black. (ie why
MAS props are black) Colors however may show contaminants more easily and create higher scrap levels if they where to monitor their color match quality............

So just know what your rpms are between the two, neither one out performs the other.........