Henry Chan Hin-lee, head of the University of Hong Kong's dermatology division, is in favour of the immune protection factor trials being run by Gary Halliday in Sydney. 'It would be a way to assess the definition of UV light,' he says. 'But whether it would be workable on a large scale depends on the industry, and whether they'll adapt it. I think it's possible.' Halliday and others are also studying the possibility of introducing a product called Melanotan, which would be either injected or implanted under the skin to give a natural, all-over tan. Chan says the research is preliminary, but that the effects wouldn't 'last too long. It would depend on the dose. After injection, it would start increasing melanin over the next 24 to 48 hours. The increased pigmentation would last possibly several weeks.' Chan says this could help better protect skin against UVA and UVB, but not to the extent that you wouldn't need sunscreen. Chinese skin has an SPF of about seven, whereas Caucasian skin can have an SPF as low as zero. But this doesn't mean Asians don't need to protect their skin from the sun. He's also not sure if it would be safe for those with a family history of melanoma.