How to match a paint color? Do you know how to match a color on the frame ?
I want to buy a paint from a tool shop but I'm not sure if it's match with the frame color.
I'm going to use the paint  for a touch up.

Thanks for the info.
The same way you would for any paint: find a swatch that matches it, or chip a bit off the bike, and then take it to a paint store and ask them to match it for you.  If it's a modern bike of a decent manufacturer you could always drop them an email, and they might be able to give you the make and model of the actual paint they use.

Also remember you will have to lacquer it afterwards, and that has an impact on it's final look.