Which one of the above is known to cause an allergic reaction in some human beings?
Which ones are used in food preparation?
Which one was banned from use in the US, but not Britain ?
Which one is a tear gas?
Which of the above can kill you?
Which one is both a medicine and something used to bleach flour?
Which one is linked to childhood asthma?
Science, evidence, safety and the food we eat. An interesting subject.