I've been making decorated sugar cookies for over a year and usually they turn out well. However on a couple of occasions (including this morning), I've had the unhappy surprise of seeing faint grease spots in my royal icing once the cookies have dried. (Photo of today's cookies attached.)From what I've read so far, apparently this can happen because the cookies were iced the same day they were baked (which was the case yesterday), and another blog I read said it can...