the process of creating the index? the main way in which people's skin colour varies is in terms of hue and lightness. we actually analysed quite a lot of people who had very, very dark skin in our process. we didn't find anybody with a blue undertone, if you like, so we tend to think that's probably a myth. the web—based tool and the index provide a framework for the detection of up to 10,000 different skin undertones. if you can basically specify every single person's skin colour uniquely, using the app and this index, then you actually have the potential in the future to match, for example, cosmetic foundation to an individual's skin colour. and in an industry where there's a lot of wastage, partially because people are buying the wrong products, further personalisation could be a good idea.