If there is any finish left on the metal, it will interfere with the bluing process. This will result in an uneven and ineffective bluing. Grind and sand the piece until you have removed a… See more

You can buy bluing solutions premixed. Dip a cotton ball into the solution and apply it to the part evenly. If you are bluing a larger piece, use a rag or brush to apply the solution.… See more

Scrub the piece in cold water.
Submerge the piece in cold water and scrub with steel wool or a scuff pad. This will create small scratches for the bluing solution to … See more

Rust bluing is the process of coating the metal in acid. Most commonly, nitric acid or hydrochloric acid is used. This allows the part to rust uniformly. Then, you scrub the rust off an… See more