Newton's rings/acid damage

1. On insufficiently cleaned façades, a cement film remains cement film after completion. Due to different types of runoff on the facade (windows, joints, ceramics) and varying intensity of precipitation, a mottled appearance occurs. The well-cleaned well-cleaned areas appear radiant and bright, especially on densely sintered surfaces. This effect is intensified by insufficient cavity-free bonding, as soluble components components leak out of the voids and become visible on the ceramics as well as being washed off the facade.

2. After cleaning the facade, the cleaning agent (an undefined undefined mixture of water, acid, silicic acid, dirt, etc.) remains on the facade, dries out and hardens. This happens usually in hard-to-reach areas that have not been sufficiently rinsed.
Typical ring-shaped impurities occur at the ‘drip points’. As the acid concentration increases sharply concentration increases sharply as it dries out, it is believed that this can lead to of the sintered layer in the micro-area, causing a permanent deterioration of the facade's optical properties is possible. However, it is however, it is more likely that the components harden into such a solid that it can no longer be dissolved by conventional means. means.

3. Newton's rings can almost only be observed on ceramic clinkers. These are probably caused by very thin and usually usually resistant deposits of colloidal silica compounds. silica compounds. Another light refraction in this layer gives such an such an appearance, which varies in intensity depending on the weather.