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Al, the cardboard is good.
It's cheaper too, like free. I always use the cardboard test as it has some dust grit in it, especially if it's recycled. Last knife I tested for Dtech or Dave I went through about 20 feet of cardboard before I could see the edge. See the edge, means looking down on the edge you shouldn't see any shiny spots. A shiny spot is a dull spot. I had sharpened it to 1000 grit as that is a good working edge, or as some say a "butcher's edge". The blade was S35VN steel and was quite abrasion resistant as that steel has 3x more Vanadium than D2, plus Niobium for a finer grain.
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