Over time it looks like the rust of an old coffee pot. It has a glossy lacquered finish on the outside of the matte metal. If the colored coating rips off, the flakes will end up in your drink. You'll also notice rust on it, which is very unpleasant in your drink. Now I'm wondering if there are any straws that say "stainless steel" that are actually made of stainless steel. I don't know of any of these brands as well-known places for kitchenware in the US.
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