You did not note which of the two sets you used the white treatment on and which you did not. It looks like maybe the towels got it. Could you follow-up with this information?
Mike Haasl flagged this submission as not complete.
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Note: I'm sure they are much whiter to the naked eye but your camera seems to have white balanced the pics and it's hard to see any difference. Please try again, maybe with a "standard" white background in both pics to compare them to (paper, envelope, wall, sheet, etc)