Yeah Rick, it might, but sometimes with these older blades you'll find that what happens is that most of the rust comes off and you reach a point where the blade is pretty clean, then it starts to colour up again and if you're not too much of a fanatic, you can get a reasonable stain job straight out of the pineapple juice without using arsenic. I suspect that what might happen is that the residual arsenic is activated by the juice.
Just remember to brush daily with a soft toothbrush under running water.
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