âSpoons come in many different sizes and are not precise enough to measure a childâs medication,â said pediatrician Ian Paul, MD, FAAP, lead author of the policy statement. âFor infants and toddlers, a small error â especially if repeated for multiple doses â can quickly become toxic.â.
Copper and bronze do not contain any iron, and only iron can rust (because rust is defined as iron oxide, a compound of iron and oxygen); so the answer is that steel will rust the fastest and copper and bronze will never 'rust'. But, yes, copper and bronze do tarnish, they do corrode.
You can only make iron oxide from iron and oxygen; you can't make it out of copper or tin, so copper and bronze can never rust. Copper and bronze can corrode or tarnish, however. In fact, all metals except precious metals like gold will eventually corrode back to a form very similar to the ores we find in nature.