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I may be insane but... Is that a remnant of a wax blob...indicating where the weight went?
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Actually, grease paint, but yes, that is the mark that was determined to place the wheel weight.
I work in the paint shop at the Ford KC plant as a supplier. A few years back, we had some warranty issues with yellow spot on units. Started to do some backtracking and the grease paint (using yellow titanium dioxide) was being applied too heavy and was flinging off the wheels as it was going thought its 'road test'. The paint, although cured, was still fresh and getting stained.
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Actually, that's the remains of a wax blob, not grease paint; GM didn't use grease paint. The Micro-Poise wheel/tire balancing equipment used color-coded wax dots dropped on the tire adjacent to the rim flange in the balancing station to indicate to the downstream weight-apply operators what size weight to use and where to apply it. I worked with the GM/Micro-Poise balancing systems for many years in Chevrolet assembly plants when I was a Production Superintendent.
