Skin- and hair gloss measurements

The measurement of gloss is very important in the efficacy testing of skin care, hair care and decorative cosmetics (lipsticks, make-up, etc.). Skin and hair are supposed to show a natural, luminous gloss without appearing oily.

The measurement is based on reflection.
glossymeter 2
Parallel white light is created by LEDs in the probe head.
To be able to emit light at 60° in a relatively small and uniquely designed measurement head, light is sent out at Glossymeter principle e0° and reflected by mirrors to 60°.
Two separate measurement channels measure the direct reflected light (again guided by a mirror in the same angle into the reflection channel) and the diffuse reflected (scattered) light.
The scattered/diffuse reflected light is measured at 0° (completely vertically above the measured surface) under the assumption that light is scattered in the same way over all degrees (diffuse channel).

So the Skin-Glossymeter GL 200 expresses both, the portion of directly reflected light (gloss) and the diffuse scattered portion from the skin or hair surface.
glossymeter 3

Another important point in determining the quality of a formulation is wash resistance and UV-resistance testing.

Waschechtheit 1Standardized swatches, as well as obtained strands of hair from probands, can be used for wash- and uv-resistance-measurements.
Standardized ultrasonic-shampooing, UV-light irradiation in combination with LAB-measurements and standardized photographic documentation of probands, results in indications regarding wash-resistance and uv-resistance of human hair when – for example – analyzing hair colorations or color-shampoos.

Waschechtheit 2

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