Black spots on silverware and rust on steel, although they are both changes in the surface of the metal, are not the same thing.
We need to understand the chemistry of silverware and steel. Silver is a relatively stable metal that does not react easily with other substances, so the surface of silverware is prone to the formation of oxidized silver, which appears as black or dark brown spots. Steel, on the other hand, is a more reactive metal that reacts easily with oxygen and water to form rust.
We compare the manifestations of the two. Dark spots on silverware are usually evenly distributed on the surface, while rust on steel often takes the form of rust. In addition, dark spots on silverware can usually be removed by some simple cleaning methods, such as using a silver polish cloth or silver washing water. Rust in steel needs to be removed with a professional rust remover or other methods.
Let's consider the reasons for the formation of both. Black spots on silverware are mainly due to the formation of silver oxide, while rust in steel is the result of iron reacting with oxygen and water. During the formation process, dark spots on the surface of silverware are usually caused by prolonged exposure to air, water or other substances, while rust of steel can be affected by various factors such as ambient humidity, temperature, corrosive substances, etc.
Although black spots on silverware and rust on steel are both phenomena of metal surface changes, their formation mechanisms and manifestations are different.