RB5 SP2 WC: The kit FR springs had blue markings on them (mine and a few others I saw locally at least), no markings at all on Rr springs. I did feel that the WC's (blue) fronts, felt stiffer than the X-Gear pink springs I had previously. I use them as an option in between the X-Gear Pink & White fronts...
RB6: X-Gear Springs included in kit, Pink FR, Red RR (both have paint dabs on them)