light renders reflected images blurry, so that distinct reflected shapes and sources of light do not distract from the art viewing experience. Scattering the light does not reduce the reflection or absorption, which remain at the level of the glass substrate. There are several ways of making the glass surface matte – from pressing the pattern when the glass is still soft to fine etching of the glass surface by acid. The quality of matte glass is usually determined by its gloss factor or haze factor. Anti-Reflective Coatings Single-Layer Single-layer anti-reflective coatings aim to achieve the refractive index of 1.25 (halfway between air and glass), and can be made either by single-layer micro-porous structures achieved by etching, hybrid materials and other processes suitable for producing large-area coatings for art framing purposes. Single layer coatings have been used as a lower-cost alternative to multi-layer anti-reflective coatings. Single-layer anti-reflective coatings can reduce light reflection to as low as 1.5%. Multi-Layer The lowest reflection can be achieved with multi-layer anti-reflective coatings, which can be applied by either magnetron sputtering, evaporation or sol-gel process (or other processes, which can control the uniformity of deposition on nanometer-scale), and can reduce the light reflection to lower than 0.25% per side (0.5% total). Features of Anti-Reflective Coatings Light Reflection - the main goal of anti-reflective coatings is to reduce the light reflection that causes the so-called glare. Therefore, the lower the light reflection, the less glare reaches the viewer. The best anti-reflective products available for the picture framing market have light reflection of 0.5%. The seemingly small differences in light reflection are actually very important due to the logarithmic response of human eyes to signal intensity (Weber's law). In other words, under normal lighting conditions, the human eye perception of the intensity of a reflected light source in a 1% reflecting glass surface will be perceived as more than twice of the same light source in 0.5% reflecting glass. Light Absorption - light absorption of glazing is the light that is neither transmitted nor reflected by the glazing. Since light is not necessarily absorbed uniformly, some wavelengths may be transmitted more than others, causing the transmitted color to be distorted. A good way to detect light absorption of glazing is so-called white paper test. This test, used to detect the transmission color of glazing, involves placing a piece of glazing on white paper, and comparing the paper's