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.
Rusting (of iron) is a common example of corrosion. Other metals, like magnesium, aluminium, zinc and copper, also get corroded by the prolonged action of air. Copper forms a green solid on its surface, whereas the others (except iron) form greyish white solids.