You are right that skin tone is a continuous spectrum. Dermatologists and skincare experts use something called Fitzpatrick Skin Types, which is a scale from 1-

You are right that skin tone is a continuous spectrum. Dermatologists and skincare experts use something called Fitzpatrick Skin Types, which is a scale from 1-6, 1 being very light skin and 6 being very dark skin: https://www.healthline.com/health/beauty-skin-care/fitzpatrick-skin-types https://www.healthline.com/health/beauty-skin-care/fitzpatri... We have formulated our products with ingredients ideal for Fitzpatrick Skin Types 3-6 (medium to very dark skin).