How can you tell if a wall is painted with oil based paint?

I need to paint a wall in a room with latex paint. However some of the other rooms in the house are painted with oil based paint (I know because the latex paint that former owners painted over it is peeling). On the wall I want to paint, is there a way to find out what kind of paint is on it?How can you tell if a wall is painted with oil based paint?
Put some rubbing alcohol on a rag and wipe a small area. If paint comes off then it is water borne, if not, then it's oil. Having said that, you can use a primer like Benjamin Moore's Fresh Start over oil. It will stick wonderfully and allow you to paint latex over. Get it tinted to the color your going with and use it as a first coat.How can you tell if a wall is painted with oil based paint?
in case you wanted a second opinion, I also am a painting contractor of 20 years and the above answer is 100% correct.