Substrate for displaying particles and/or layers of material taken up by it allows very different articles and cleaning to be easily graded again and again regarding cleanness and cleaning efficiency

摘要

Various articles and cleaning fluids can be easily graded again and again regarding cleanness and cleaning efficiency. A substrate is made from a black or dark-colored material or it has at least one such surface. On one of the substrate's surfaces a coating is applied whose spectral reflection lies below 1.5 percent in the center during irradiation with light in a wavelength range between 400 and 700 nm while the light's angle of incidence is between 0 and 15 deg .