Today, hair dyes are widely used, either to cover up grey hairs, or simply by those wanting to change their natural hair colour. The chemistry behind how they change the colour of hair can actually get pretty complicated, but this graphic tries to boil it down to the key classes of chemicals involve more
It’s been a while since the last update to the Everyday Chemicals series – this latest graphic looks at hydrogen peroxide. Everyone’s familiar with the term ‘peroxide blonde’, stemming from the use of hydrogen peroxide in hair dyes, but this accounts for just one of the compound’s many uses; it’s al more
Honey is something of an oddity, in that, unlike most foods, it doesn’t spoil over time. In fact, the oldest known sample of honey, found in an Ancient Egyptian tomb and dated to approximately 3000 years ago, was still perfectly edible (supposedly*). What is it, then, that gives honey this unusual p more