Update (after 5 weeks' use) - The best way to tell if private info is being covered is to look with a magnifying glass. Sometimes things that appeared well-concealed become apparent when magnified. In those cases, a second swipe often helps.Certain kinds of writing, like large fonts or printed inks with some sheen, won't be covered well, no matter how many times one rolls over them.As in some other reviews, my roller ink grew faint, and it happened after only a few weeks. I refilled the ink, and then it covered well again. We'll see how long a refill lasts.Overall, I still find the ink roller better for recycling (they don't take shredded paper locally). And for some reason, it's more enjoyable than shredding!Original review - One swipe will obscure some confidential info. But make sure the paper absorbs the ink. It won't work well, as the seller notes, on glossy papers or with raised ink - or even on some matte card stock. On regular paper that absorbs the ink, one roller swipe might still allow some info to be seen when inspected carefully especially if rubbed with wet paper towel. But you'd have to think that someone is going to bother to look diligently, as it's still not easy to see fully. With 2 roller swipes on absorbent paper, even after rubbing with wet paper towel, the ink will smudge so much that it will likely obscure most confidential info. ("Made in China" is printed on the bottom of the box, FYI.)
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