Isn't it also fair to say that CCH relies in small part on organic materials (bone and charcoal) that add to appearance but don't necessarily "bake in"?

When CCH fades out I assumed some of the surface material had wiped away, been worked away, been chemically altered by years of oil, or UV had destroyed over time.

I personally like old CCH with blue and grey remaining and with some of the straw and brown gone.