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Stainless is less, not none.
There is still iron in the alloy.
Stainless steels are also prone to corrosion from chlorine (chloride).
Stainless is often 'passivated' after machining.
By dunking the stainless in acid any exposed iron is removed leaving a surface that is less prone to rust formation.
The process also removes any smears of tool steel left behind by cutters used.
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