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This white food compliant ABS plastic handled peeler has the same self sharpening nickel carbon blade as my professional metal handled ...
I don't think that's the link you meant to post RD 
BTW, does it come with a cardboard pyramid?
I have two propositions: (a) The potato doesn't dull the blade of the potato peeler, due to the starchy, soft composition of the potato. The potato is not hard enough. In geology, a harder mineral/rock will scratch a less-hard one. Since the potato is not as hard - geologically speaking - as a (presumably) steel peeler, it wont scratch or dull the blade.(b) According to WolframAlpha, http://www.wolframalpha.com/input/?i=potato+mineral+contentA 100 g Irish potato has about 1.1 g of minerals in it. That's 1.1% of its total mass.So the potato could have a great enough mineral content for the minerals in it to rub up against the steel blade to keep it sharp upon peeling. It would be like cutting with a knife into a big chunk of candle wax that has mineral particles spread out inside it. The minerals embedded in the wax could be concentrated enough to scratch the sides of the blade.
Quote from: Geezer on 07/03/2011 19:07:27I don't think that's the link you meant to post RD I didn't want to link directly to the peeler product and give it a free advert.It's on ebay, readers can Google the quote if they want to find it. Quote from: Geezer on 07/03/2011 19:07:27BTW, does it come with a cardboard pyramid?The "self sharpening" phenomenon is legit: no pyramid power required. One side of the blade is harder than the other, the softer side wears away faster, as it wears a new angled (sharp) edge is constantly being created ...