The Science of Hair Shine is the second title

The Science of Hair Shine is the title

Radiant hair is infinitely desirable, yet it can be so elusive. With Elixir Ultime, the scientists at Kérastase have harnessed the power of shine to infuse every strand with undeniable brilliance.

Sometimes it feels like a losing battle trying to achieve and maintain shiny hair. Between heat styling, product residue, environmental factors and other stressors, hair can easily become dull and matte, a frequent disappointment for those who prefer a glossier look.

But there is a science behind shine, and it is a code we’ve managed to crack. Here is some of the knowledge we’ve used to create an iconic product, now empowered to take shine to new levels of intensity.

Two Types of Shine

Not all shine is created equal. When light hits the hair, it can create two types of reflection—specular and diffuse. Specular reflection is symmetrical, creating a bright, mirror-like shine. Diffuse reflection scatters light, weakening its intensity. How much of each type of reflection you see depends on the condition of the fiber. Rough surfaces produce more diffuse reflection, which is why damaged hair often appears dull.

The Golden Ratio


The ideal conditions for shine yield a high ratio of speculative to diffuse reflection, and Elixir Ultime is designed to encourage that high ratio by smoothing and nourishing the fibers instantly.

Speculative Reflection = Overall Shine
Diffuse Reflection                             

Science of Shine Article 02 Kérastase

Enemies of Shine


Deposited on the hair in the form of dust or product residue, dirt disrupts the hair’s ability to reflect light, causing it to appear dull and matte.


Natural oils from the scalp can seep onto the hair when it hasn’t been cleansed, clouding the surface of the fiber and reducing the hair’s capacity for intense shine.

Friends of Shine

Marula Oil

Extracted from seeds inside the hard kernel of fruit from the Marula tree, this precious oil has incredible moisturizing and nourishing properties. It softens and smoothes the hair, promoting a high level of light reflection, which appears to the eye as intense shine.

Camellia Oil

Taken directly from the seeds of the Camellia oleifera flower, precious Camellia oil is widely revered for its nourishing qualities. Comprised largely of oleic acid, linoleic acid and vitamin E, its nutrients can smooth and calm any hair type, creating the ideal conditions for high shine


Your Personal Care

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Fusio-Dose In Salon

Learn about the signature in-salon service that transforms hair quality in under 5 minutes.

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The Right Products for You

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