Twit I believe your observation to be correct. I went out and took some new photos of some heuffs. There is a difference between normal color change process and color change due to damage.
I do need to go back out now and get a better close up of the spotted color change to see if we can see what is going on.
Passat making normal color change.
Perfection with normal color change and some damage.
Elmo's Fire with a combination of color change, from normal to damage color change.
Chris, can't wait to see a close up of your Clinton. That has a lot of speckling going on. Sure is pretty. : )