I'm posting this here since the mechanics forum FAQ reminded me C&V might have more direct first-hand experience with my issue.
I've dusted off my old road bike and am currently cleaning the second pair of wheels i have. These are Wolber Super Champion Aspen tubular rims i built and raced myself back in the early 80s. DT 15 spokes, ofmega hubs. I'm noticing lighter colored discoloration at each spoke area, just on the sidewalls, on both sides of each rim. I don't recall seeing them back when i used them and they've been stored in garages since i last wore them back in the late 80s. The spokes do not seem overly tight at all by feel, though i do not have a tension meter. Also, it's only a discoloration. There is no bump i can feel at these marks at all, it's just a visual clue. is this just something that happens to hard anodized rims over time? in your experience, is there cause for concern in the rims' structural integrity?
see the attached jpeg. thanks for any input.