Surgical Instrument Care — Rust vs. Stains

Stains can be removed, whereas rust will leave permanent damage. To determine if a brown/orange discoloration is a stain or rust, use the eraser test. Rub a pencil eraser aggressively over the discoloration. If the discoloration is removed with the eraser and the metal underneath is smooth and clean, this is a stain. If a pit mark appears under the discoloration, this is corrosion or rust.