Touch up paint?
 

So I scored a Centurion steel-frame at a yard sale this morning for $20. Looks good except for minor scratches and some major corrosion at the brake-tube guides that are brazed onto the top tube. Assuming I can clean the guides, how do I match the paint on that frame for repainting them?

Look at and compare lots of paint chips, or, if you have a Sherwin-Williams automotive paint store, they should have a hand-held color match scanner. Of course, this assumes that your Centurion has a paint color that is close to anything used on a car. Some other brands may use this, too.

Thanks, vpiuva. Next, what's the best way to clean the rust off the guides without further damaging the paint?