What is Google's new skin tone scale?

Google has unveiled a more diverse scale of skin tones to develop its artificial intelligence systems. The new Monk Skin Tone Scale, named after Harvard University professor Dr Ellis Monk, has 10 skin tones. Google says it will replace outdated skin tone scales which have a bias towards paler skins. The tech company claim it will be used to improve products like search and photos. Machine learning, a type of AI, is used by a lot of technology including cameras which recognise a face to unlock a phone or when your photos are categorised automatically. But to get to this point researchers need to train the technology so that it can recognise a wide range of people.