|The majority of the hairs on the pillow are light at the edges of the pillow, the middle is darker in value.|
Each hair has a cuticle, which acts as a mirror that reflects a certain ratio of light—the higher the number of layers, the higher the ratio of the reflected light and the more intense the shine.
Shine is perceived in two parts: the Chroma-Band, which reveals the color within the hair shaft, and the Shine-Band, which is a pure reflection of the light off of the hair's protective coating.
'The physics of hair shine really is the reflection of light not just off the cuticle but through your cuticle,' explains Dianna Kenneally, a principal scientist at P&G Beauty (a division of Procter & Gamble). 'The light actually goes through the cuticle, absorbs the color of your hair and comes back.'
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