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...besides what has already been said here, it often works out that even with a good color match, fading the touched up area into the area you are repairing is difficult. One workaround is to simply mask off the rest of the bike, with the exception of the frame member you're working on. For example, some bikes are OK except for the stays. So you can mask off the rest of the frame, and simply spray out the stays, after you prep the chips with sanding.
The other thing to learn is that it is pretty rare to find a paint color that is completely opaque, especially in the metallic colors. So you often need to figure out what the primer color is on a particular frame, and prime the area again in places where both the color and the primer are missing.
Rauler blue and Colnago blue are basically the same color coat paint, with a different primer under the blue.
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