Does white vinegar sharpen knives?

White vinegar does not sharpen knives. Vinegar contains acetic acid, and acid does not create or refine a cutting bevel the way a stone or ceramic sharpener does. It can remove some rust, break down mineral residue, and darken carbon steel by forcing a patina, but none of that restores edge geometry. A blade may look cleaner after vinegar treatment and may even feel slightly smoother if corrosion was dragging on the edge, but a dull knife stays dull until abrasive sharpening reshapes the bevel. Long exposure can also etch the blade and promote new rust if the knife is not rinsed and dried well. Vinegar is a cleaner, not a sharpener.