What does it mean? Some sites have different grades, (which confuses me btw). For instance, they may have, "apricot kernal oil, 16oz. @ 12.00", then underneath they have, "apricot kernal expeller pressed oil, 16oz. @ 6.00". What's the difference between the two? Is one oil, better than the other? I have to admit this expeller pressed, is more in my price range,.... but I'm not trying to risk a batch of soap ya know!:undecided