I don't know if GEC's Calico Bone has really been around long enough to show any real long term aging but typically bone will darken with age especially the lighter colored bones. They will absorb oils & dirt from your hands etc. This is if you use it and don't just collect and store it away. I'm sure there will be some more knowledgeable answers soon.
I have a eureka jack that I used pretty hard when I first got it. The brass has oxidised underneath the scales so that you can see green through the calico which is pretty transparent. It's odd. I'll get a picture if I can.
If a knife I have for sale goes through I was looking at possibly getting a GEC #9 Esquire. I prefer the look of the blade (long pull & swedge) on the upper end UN-X-LD versions. Not too big on the Abalone or Mother of Pearl, and I don't like the additional blade etch of the snakewood. The stag examples I have seen just haven't struck a chord with me either. This leave me with Cocobolo or Calico Bone.
Have a Northwoods Nortfolk in this bone, made the mistake of giving it a vinegar-bath to patina the blades and backspring. It worked, it worked a number on the bone too :barf: Rather shocked as it was not dunked in vinegar for a long time and, i've done it to jigged bone knives with no ill result. But now it's matte and rough, tried a wipe over with lemon oil and furniture polish, some improvement but it's no longer smooth.
Moral: don't mess about with corrosives near this bone....
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