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.
How long will it take for bronze (which is a different metal than iron) to become rust (rotted iron): never ever. Bronze and other metals can rot, corrode, tarnish, whatever -- but they can never rust because rust is defined as oxides of iron, the corrosion product of iron, rotting iron.