I agree with the color variance thing and not just on Schwinns and not just due to environmental affects. I've seen at east three shades of apple green used on Schwinns. I've also noticed original paint bikes with Sheetmetal, especially tanks that are slightly off. Even with standard paint formulas there will be some variance and if tanks, guards, or racks were painted one day and frames a months later then it stands to reason you won' always have an exact match. I keep a notebook of all the paint codes I get mixed with the year and model of bike. I probably need to move this to a digital format so I have it in more than one place. I also started air brushing small sheet metal squares with the colors as well so I have, basically, a big paint chip. V/r Shawn