I've always thought that stainless steel was impervious to corrosion.
Recently, I was gifted with an engraved "hip flask". On the bottom, stamped "Stainless Steel" right next to the "Made in China " imprint.
The enclosed papers warn; "DO NOT store any liquids in this container for more than four days ! After that, drain, and rinse."
What aren't they telling me ?
I don't intend to work thru a flask of brandy every four days......
Stainless steel ??