This subject came up in another thread when it was noted that the heavy wire clip/staple had been applied around the base of the wire loom near the lamp end of the loom
Appears to be that the clip/staple was dyed red originally. Looks like it may appear pink after years of exposure.
Have seen this on other years but we'll start with 67 since that is where the discussion started.
Will add my examples/evidence as I get time to post more
First set of examples are from 67 San Jose examples excluding (at this time) Shelby's just because I haven't gone through the thousand or more examples I have pictures of
7R01A1533xx
7R02C1583xx
7R01C1834xx
7R01C2230xx