One can leave partial fingerprints behind wearing thin blue or semi-clear latex gloves, if one grips something hard enough. It isn't oil residue from your bare hand, but rather the major ridges on your fingers can press hard enough on the inside of the glove to leave traces of impurities on the gloves behind in the ridge pattern. As for those who say the gloves are clean when they come out of the box, they have a fine powder on them so they don't stick together. Also, as soon as you touch something, they have residue on them.
Thin suede leather or medium weight cotton gloves (think of the gloves art dealers and museum curators wear when handling artifacts and statues) can't leave finger ridge marks behind. They can leave DNA behind, so wear latex gloves under them.
