Courage + Khazaka electronic GmbH

FAQ

Mexameter®/Skin-Colorimeter - Color Measurement on the Skin

Mexamater face with ring start

FAQ for the Mexameter®/Skin Colorimeter

The measurement gives an error message

Which melanin/erythema/colour value is normal?

When to use the Mexameter® and when to use the Skin-Colorimeter?

Can you compare data from the Mexameter® MX 16 with those of the Mexameter® MX 18?

What is the ITA value measured with Skin-Colorimeter?

How do Mexameter® and Skin-Colorimeter correlate with the Chromameter?

Is the Mexameter® suitable for the development of sunscreen products?

 

The measurement gives an error message

dmexsondarm

The most frequent reason for this is that too much ambient light reaches the inside of the probe. Therefore, please use the foam ring supplied with the probe as a shield against the ambient light or use your hand to shield the probe. Do not measure under strong light sources.

top

Which melanin/erythema/color value is normal?

The melanin- and erythema values are individual for each person and depend strongly on the ethnic group.  The measurements are generally used to determine changes before and after a treatment/application of a product. Experience melanin values for the 6 known photo types can be found in several studies and in the instruction manuals.

top

When to use the Mexameter® and when to use the Skin-Colorimeter?

The Mexameter® determines an index for melanin- and erythema values, the main colour giving parameters of the skin very accurately. The Skin-Colorimeter however expresses the skin color as a coordinate in the colour space (e.g. L*a*b). Therefore it can measure colour changes resulting from e.g. carotenoids (self-tanning products) or make-up and decorative cosmetic products.

top

Can you compare data from the Mexameter® MX 16 with those of the Mexameter® MX 18?

Mexameter MDDNo, not directly. The output of the MX 18 is more sensitive to show color changes than the MX 16 was, thus the results will be shown on a scale of values from 0-999 which differs totally from the scale of the MX 16. However, on request a formula to change "old" data into new is available.

top

What is the ITA value measured with Skin-Colorimeter?

The software calculated a value called ITA (individual typology angle) which is known in literature to describe the different Fitzpatrick skin types. The higher the ITA value, the lighter the skin.

top

 How do Mexameter® and Skin-Colorimeter correlate with the Chromameter?

Skin colour measurements are much more difficult than colour measurements of objects as the skin consists of different layers and is translucent. In addition, the skin guides (transports) the light. Ambient light as well as the light emitted by measurement devices, penetrates the skins to different depths and is not absorbed and reflected in the same way. The main components giving colour to the skin are melanin (the pigmentation) appearing brown/grey in the upper layers and haemoglobin (part of the red blood) appearing red sometimes even bluish which is found in the deeper layers of the skin. If the light emitted by the probe does not illuminate a large area of the skin uniformly, the blue portion in the measurement may be overproportional. The deeper a Colorimeter comparisonmeasurement penetrates the skin, the more light is absorbed, less light is reflected and the more different the measured colour will be from the percepted colour.

Those physical properties of the skin make skin colour measurement very complex. The different light sources of the measurement devices, different pressure on the skin surface and the different measurement area, in addition to the skin's special properties make it difficult even for the current, established measurement methods to determine the real skin colour and their results are not completely comparable. When looking at the results, each measurement method should be looked at separately.

Both, Mexameter® and Skin-Colorimeter measure very superficially, thus staying close to the color perceived by the human eye. The correlation between the instruments and the Chromameter has been examined in several studies. In the example graph: 2 C+K skin-Colorimeter probes compared to a Chromater probe. The L*-values are absolutely comparable. There are slightly higher a* values (reddish/brownisch colour) measured with the Skin-Colorimeter and slightly higher b* values (blueish-yellowish color found with the Chromameter, explainable by the fact that the Skin-Colorimeter measures very close to the skin surface.

top

Is the Mexameter® suitable for the development of sunscreen products?

Yes, it is one of the key applications for the Mexameter®. The MED (minimal erythema dosis)  can be verified after irradiation with solar simulating systems.

  Sonnencreme

 

 

 

 


top

With the usage of our services you permit us to use cookies.