Light is not only reflected on the surface it is also naturally re-emitted from deep within the skin. This is skins inner light. At its peak, this surface radiance (1) and inner light (2) constitute skins aura. When visible light reaches skin, it begins a real journey:5% of light is reflected: this is skins surface radiance(1)95% penetrates skin and interacts with the epidermis and dermis.55% is absorbed(2) this is skins inner light. Aura-Inside Technology: A LANCOME exclusive which associates: Bioptic pigments combined with classic mineral pigments. Together, they reproduce the inner light of perfect skin, by recreating the intensity and pristine freshness of its radiance. A unique liquid light essence maximizes skins surface radiance.