The results of these measurements,
with the relative error, are reported in Table 1. It is evident that there is a good reproducibility on the measured roughness. The values are compared with the RMS roughness obtained on a silicone mould of in vivo skin.
2.2. Spectro-photometric measurements
All substrates have been characterized by transmittance and reflectance measurements (total and diffuse). Measurements have been performed with a Varian Cary 5000 UV/VIS/NIR (ultraviolet– visible–near infrared) spectrophotometer using a UV/VIS/NIR integrating sphere. The instrument spans a spectral wavelength range from 175 up to 3300 nm. Its optical system ensures a maximum level of light throughput that produces accurate