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.
Different types of pigments and dyes exhibit varying degrees of photokestävyys. Organic pigments, for instance, are