Paint has many functions. On the one hand, it protects the structure and, on the other hand, it is an important design medium in architecture and urban planning. This is because the colour of a paint underlines the individual character of a building, a street, an ensemble or an entire location. So colour design is anything but trivial or arbitrary
But paint also changes colour: wood goes dark or grey, white coats of paint become yellow and facades fade. The latter can be avoided: with mineral facade paints and their extremely lightfast inorganic pigments. The house paint remains unchanged for decades!
Many house paints change, some faster and some slower – this is due to pollution, harmful substances (so-called "acid rain") and, in particular, the proportion of UV in sunlight. While dirt diminishes the brilliance of paint's colour, UV light can lead to a change in the paint itself. The binder in emulsion paints breaks down, as seen particularly in a white fogging effect on brightly coloured coats of paint. Dirt or fouling on the coats of paint naturally also changes the visual appearance.
The phenomenon of house paints changing colour has been known for decades and is an obvious visual flaw on buildings for all to see. You're also sure to be familiar with the typical picture of the so-called "shutter effect" – the facade has faded, while the original colour shade of the exterior paint can be seen essentially unchanged behind the shutters, protected from light and the weather. These and many other manifestations related to colour changes have a considerably detrimental effect on the overall impression of a facade. They are not only unattractive but also counteract every intended colour design.
Basically we differentiate between organic and inorganic (mineral) pigments. UV light causes a change in the chemical structure of organic pigments and thus in their colour. This does not apply to mineral pigments. They are made from natural raw materials such as iron oxides, for example, and stand out with an extremely high colour shade constancy. They are thus durably lightfast and UV-resistant, and retain their colour for decades. Not even "acid rain" can harm them. Colour-constant coatings – silicate facade paints – can be presumed to consist of only selected mineral pigments.
The binder also has a considerable influence on the colour of a house paint. Organic binders such as those used in emulsion paints are made from synthetic materials. They change in time and go milky. Microscopic cracks can form. The colour of the facade paint becomes greyer and less pure.
Silicate paints by KEIM are made only with inorganic binders such as potassium silicate or sol-silicate. They allow light rays to hit the colour pigment unhindered and permanently. Furthermore, the binder causes the coat to form an insoluble bond with the substrate, based on the silicification principle. Spalling of the house paint is thus not possible. Nor do mineral paints attract dirt particles in the same way.
KEIM mineral paints contain only top quality inorganic pigments. Such a consistent approach is unique on the paint market and ensures brilliant facades for you in the long term!
Mineral paints by KEIM therefore remain unchanged for decades, ensuring brilliant facades with lasting colour stability. Actually, some facade coatings with KEIM paints are 100 years old!