This test method is applicable to a substantially broad spectrum for claims; which includes wrinkles and fine lines reduction, skin smoothness, skin elasticity, skin relief, pore sizes; etc.

The measuring principle of the instrument utilised for this type of instrumental substantiation is based upon the suction method, where negative pressure deforms the skin mechanically. Pressure is created inside the device and draws the skin into the aperture of the probe and after a defined time, releases it again. Inside the probe, the penetration depth is determined by a non-contact optical measuring system. This optical measuring system consists of a light source and a light receptor, as well as two prisms facing each other, which project the light from transmitter to receptor. The light intensity varies due to the penetration depth of the skin. The resistance of the skin to the negative pressure (firmness) and its ability to return to its original position (elasticity) are displayed as curves (penetration depth in mm/time) in real time during the measurement. From these curves a variety of specific measurement parameters can be calculated in relation to elastic and visco-elastic properties of the skin surface and skin aging.