pknauth,
See this other forum for more info:
Vintage Chevy restoration/preservation Back to topic: All the springs are painted the same chassis black as the frame. Sandblasting may leave bits of grains stuck in between the leaves so air blow (or pressure wash) them out really-really well. The sand is super hard to get out of tiny crevices and most guys blast them dis-assembled. Some folks then re-assemble them with Teflon or Nylon thin sheets in between the springs to smooth down the friction between leafs and decrease the squeek.
On color: a seperate "chassis builder" would sometimes repaint the frames a contrasting paint color for "commercial" paint jobs. A Cab/fenders may be Red for instance, and the frame past the cab with springs would be Green. This was done especially when just a cab/chassis was ordered from the factory minus the bed and a builder would put a commercial bed on; like a delivery truck. One popular commercial frame painting scheem was matching the frame color (rearward of the cab) with the Cab color, while the fenders were painted black. These original commercial paint jobs are super rare to find and look strangely cool, if you are lucky enough to find them.
Otherwise springs are 99.99% ....black.
John
1952 2 ton COE
1947 COE tractor