Whitening Effect test result of Vital Bright Serum
This test shows the skin radiance efficiency measured by 3 variables as follows:
L parameter: It is the skin radiance value measured by the change of light incidence and reflection from bright to dark. If the L parameter value increases, it means the skin is brighter.
b parameter: It is another skin radiance value which is measured by the change of light incidence and reflection from blue to yellow. If b parameter value decreases, it means the yellow degree of the skin reduce (Asian is normally yellowish).
ITA: It is a value of melanin production that transforms based on L and b. If ITA value increases, it means the melanin production decreases.
The test shows that the constant application of Vital Bright Serum can brighten the skin (L parameter value increases), and decrease melanin production (ITA value increases) significantly, but the yellow skin is still the same, resulting in natural look (b parameter is consistent).