Hair radiance is measured at different stages:

• Before degradation: initial measurement
• After deliberate degradation of the hair
• After the first application of the routine

Then after 24 h, 72 h and 96 h

An additional measurement is taken after 8 applications, approximately 1 month of use.

Shine is measured using a professional spectrophotometer, using a gloss indicator at 8°, allowing precise evaluation of the radiance and mirror shine of the hair.

The strands are placed in a controlled climate chamber to ensure the reliability and reproducibility of the results.

The strands are subjected to controlled humidity conditions to assess the hair's resistance to frizz.

Measurements are taken:

• before treatment
• after application of the routine
• then after 24 h, 48 h, 72 h and 96 h
  

The hair is placed in a climate chamber:

Temperature: 30 °C
Relative humidity: 70–80 %

The anti-frizz effect is visually assessed by an expert based on a defined scale. 

Hydration is measured:

• before hair degradation
• after degradation
• after treatment with the routine
• then after 24 h, 72 h and 96 h
  
  

The structure of the hair fibre is also analysed using an electron microscope (SEM) to observe:

• the closing of the cuticles
• the reduction of damage
• the improvement of the hair surface.

The water content of the hair is measured using an evaporimeter