Dave- suppose I'm cataloguing a group of raw tobacco cards and I decide to first finish my meatball hero. To my great chagrin one of the meatballs falls splat onto my T206 green Cobb. I quickly grab a paper towel and wipe the tomato sauce off the card.
Have I just altered it? Because wiping off the sauce is equivalent to erasing a light pencil mark, in my book.
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