call hue in science. it's not about "is your skin light or is it dark?" it's nothing to do with lightness. it's to do with the colour that runs through your skin. so, you can be very light and be pink, you can be very light and be yellow. and it's very important to know that so you can actually get beauty products that work for you. there are different ways to measure skin undertone, but farah believes her company's skin—colour chart, which powers the tool, makes the method unique. having an actually olive complexion, i really struggled to find make—up that would match. and being a biochemist, i decided to look into it. and i discovered that beauty magazines were recommending, "look at your veins and that will help "determine your undertones." we realised that there was no way that actually skin was being classified accurately. so we thought, "right, we need to start "right at the beginning." we started by reclassifying the entire human skin gamut entirely, and we came up with what's called the naz—westland index,