fotokestäviä

Fotokestäviä is a Finnish term that translates to "lightfast" in English. It is primarily used in the context of pigments, dyes, and inks to describe their resistance to fading or degradation when exposed to light, particularly ultraviolet (UV) radiation. Materials that are photokestäviä are considered to be of higher quality and are preferred for applications where color stability is important over time.

The photokestävyys of a material is a crucial factor in its longevity and suitability for various uses. For example, in art and printing, pigments with high photokestävyys are essential for creating artworks and printed materials that will retain their original colors for many years without significant fading. This is especially important for outdoor applications like signage, murals, and architectural elements, as well as for archival purposes in museums and galleries.

Different types of pigments and dyes exhibit varying degrees of photokestävyys. Organic pigments, for instance, are often less photokestäviä than inorganic pigments, although advancements in organic pigment chemistry have led to the development of more lightfast options. Testing for photokestävyys is typically done using standardized methods that expose the material to controlled light sources for extended periods and then measure any color changes. This allows manufacturers and consumers to compare the lightfastness of different products and make informed choices.