What paint color did they use?

[Joseph Weisenbloom]

So I did a search for this topic and didn't find an answer so I figured I would create a thread. So here is the scenario you buy a house that is painted a particular color. The paint job is in good condition for the most part but you would like to know the paint color/brand just in case you want to do some touch up work.

Question is how do you find out what paint they used? Is the only option just to contact the former owners? Should I be doing touch up work or should I only worry about this when I am due for a full paint job? BTW I am talking about the exterior paint of the building.

Thoughts?