Do I need to rinse canned beans?
Yes, it's always a good idea. Why? Most canned beans are packed in a thick, salty liquid that adds unwanted texture and taste to a dish. Like many other canned foods, beans also contain a popular color preservative called calcium disodium EDTA. No bad side effects of the compound have been identified (though EDTA did have a role in the O.J. Simpson murder trial).
To wash canned beans, just pour them in a colander, rinse well with cold running water, and swish the beans around until most of the water drains off. If you don't use the whole can, toss the remaining beans with a splash of vinegar to preserve them longer. Store them in an airtight container (not the can) in the refrigerator for up to a week.