The Physics of Light Refraction on the Hair Cuticle
Hair shines when light rays strike a flat, smooth, uniform surface and bounce back at a coherent angle (specular reflection). When hair cuticles are raised, porous, or damaged by heat, light scatters irregularly (diffuse reflection), making hair appear dull and frizzy.
Dry oil mists deposit a sub-micron film of low-viscosity esters that fill micro-voids between cuticle scales. This instantly levels the hair surface into a smooth optical plane, maximizing specular light reflection for high-gloss shine.
Dry Oils vs Wet Oils: Understanding Volatile Carriers
Traditional 'wet' oils (like pure castor or olive oil) consist of heavy long-chain triglycerides that remain wet on the hair shaft, gathering dust and pulling down natural volume.
'Dry' oils are formulated with branched esters (such as isononyl isononanoate) and lightweight polyunsaturated botanical oils (camellia, rosehip, squalane). These absorb and evaporate rapidly, leaving a dry, silky finish that feels completely weightless to the touch.