How does SPF get tested?

Australians are no stranger to sun safety — but there's a dispute playing out across the country around SPF ratings that has many Australians questioning how protected they really are. A report released last week by consumer group CHOICE found 16 of 20 popular Australian sunscreens fell below their claimed SPF rating. All of the tested brands have disputed the report, pointing to their own independent SPF tests that confirm their products are compliant. GUEST: Dr Michelle Wong, Chemist and Science Communicator PRODUCER: Brooke Young