Why do older knife handles often become discolored?

• A. They are exposed to excessive heat
• B. The materials react with blood
• C. They are made of brass
• D. They are cleaned improperly

Answer: (C)

The discoloration of older knife handles can often be attributed to being made of brass. Brass is an alloy primarily composed of copper and zinc and is known for its lustrous appearance and resistance to corrosion. However, over time, brass can tarnish and change color due to several factors, including exposure to air and moisture which can lead to oxidation.

As brass oxidizes, it develops a patina that may lead to discoloration. The handling of the knife can cause additional reactions, as skin oils and moisture can further contribute to the changes in color. While other factors, like improper cleaning or exposure to substances such as blood, can lead to issues with knives over time, the fundamental cause of discoloration in this context is closely linked to the properties of the brass material itself.