overview

Bronze was discovered over 6500 years and emerged as a useful material to produce tools and artwork. It durability is evident in the survival of artifacts dating to 4500 BC in southeast Asia. Some Chinese grave pieces dating to 3000 years ago have been found in almost pristine condition in spite of the fact that they were exposed to moisture and soil abrasion for millennia. Moisture will not damage bronze making it an ideal material for public and garden art pieces.

Bronze is an alloy of copper and any metal except zinc. Bronze pieces are generally cast either in a single pour or from multiple pieces which are welded together. Bronze is an extremely durable metal. It is generally more corrosion resistant than brass, steel or iron and is more expensive than brass. It is favored for the beautiful natural patina that forms as the metal is exposed to the elements. Bronze will darken with age especially if the piece is exposed to the elements. Weathering will produce a green verdigris coating which protects the metal. This finish is often seen on older pieces and is sometimes artificially reproduced on modern castings. Natural coloration adds to the value of the bronze piece and should not be removed.

maintenance

Bronze is easy to maintain. Indoor pieces should be dusted regularly using a soft cloth. Do not rub too vigorously, especially on any small or fine protruding parts. If a bronze piece has been neglected for a long time and is covered with grime, thoroughly clean it with a soft brush. Remove all dust from crevices and notches and then lightly rub the entire surface with a soft flannel cloth.

For a more thorough cleaning, carefully wash the piece with a solution of 1 tablespoon of salt and 3 1/2 quarts of water. Rinse well. If a higher polish is desired, any natural wax such as coconut oil, beeswax or carnauba can be applied to the surface after it is thoroughly dry. Take care to remove wax buildup in crevices as they can absorb and retain unwanted elements over time.

Modern artists are now producing a variety of beautifully colored patinas over bronze castings. These finishes run the gamut from baked on coatings to chemically attached bonding overcoats. Cleaning these pieces should only be undertaken with instructions from the artist or manufacturer.