fényerképessege

Fényerőképessege is a Hungarian term that translates to "lightfastness" in English. It refers to the resistance of a dyed material, pigment, or colorant to fading or degradation when exposed to light. This exposure can be from natural sunlight or artificial light sources. The degree of lightfastness is a crucial property for many applications, particularly in textiles, paints, inks, and plastics, where maintaining color integrity over time is important.

Different materials and colorants exhibit varying levels of lightfastness. Factors influencing lightfastness include the chemical structure of the dye or pigment, the substrate it is applied to, and the presence of any protective additives. Lightfastness is typically measured using standardized tests, often involving exposing a sample to controlled light conditions for a specific duration and then assessing the degree of color change. This change is usually rated on a scale, with higher numbers indicating greater resistance to fading. For instance, in textile dyeing, a high lightfastness rating means the fabric's color will remain vibrant even after prolonged exposure to sunlight. Conversely, a low lightfastness rating suggests the color is prone to fading relatively quickly. Understanding and ensuring adequate lightfastness is essential for product durability and customer satisfaction in industries where color stability is a key performance indicator.