Supercilium Brow & Lash Dye Medium Brown is a beautifully intense shade that works perfectly on clients with dark-blonde or light brown hair with warm skin tone. The shade has a blue-green core with a natural base. Although it’s on the cooler side with a slight green base, it can be versatile and used as a neutral brown on many clients. It will stain the skin for up to 9 days* and the hairs for up to 7 weeks.